RangeError (length): Invalid value: Only valid value is 0: 1 on reducing label list size.

**Describe the bug**
When reducing the list size of the labels, I am getting a RangeError. I am not sure if I am doing something wrong or if this is an actual bug.

**To Reproduce**
Press on button to change the size of Label list.
```
bool showMoreLabels = true;
Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'showMoreLabels: $showMoreLabels',
            ),
            const SizedBox(height: 10.0,),
            TextButton(
              style: const ButtonStyle(
                backgroundColor: WidgetStatePropertyAll(Colors.blue),
                iconSize: WidgetStatePropertyAll(20.0),
              ),
              onPressed: () => {
                setState(() {
                  showMoreLabels = !showMoreLabels;
                })
              },
              child: const Text(
                'Press here to show more or less labels',
              ),
            ),
            const SizedBox(height: 20.0,),
            ToggleSwitch(
              minWidth: 100,
              initialLabelIndex: 0,
              totalSwitches: showMoreLabels ? 2 : 1,
              labels: showMoreLabels ? const ['MORE', 'LABELS'] : const ['LESS'],
              onToggle: (index) {
                if (kDebugMode) {
                  print('onToggle: $index');
                }
              },
            )
          ],
        )
```
This also happens when you try to reduce from n to (n-1 or more) labels. Increasing the label size work just fine.

The stacktrace is shown below.
```
======== Exception caught by widgets library =======================================================
The following RangeError was thrown building ToggleSwitch(dependencies: [InheritedCupertinoTheme, MediaQuery, _InheritedTheme, _LocalizationsScope-[GlobalKey#2fbbf]], state: _ToggleSwitchState#94aed):
RangeError (length): Invalid value: Only valid value is 0: 1

The relevant error-causing widget was: 
  ToggleSwitch ToggleSwitch:file:///Users/imaduddin.mohammed/Downloads/toggle_switch_test/lib/main.dart:105:13
When the exception was thrown, this was the stack: 
#0      _Array.[] (dart:core-patch/array.dart)
#1      _ToggleSwitchState._switchItem (package:toggle_switch/toggle_switch.dart:402:41)
#2      _ToggleSwitchState.build.<anonymous closure> (package:toggle_switch/toggle_switch.dart:263:22)
#3      new _GrowableList.generate (dart:core-patch/growable_array.dart:136:28)
#4      _ToggleSwitchState.build (package:toggle_switch/toggle_switch.dart:253:26)
#5      StatefulElement.build (package:flutter/src/widgets/framework.dart:5729:27)
#6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5617:15)
#7      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#8      Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#9      StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#10     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#11     Element.updateChildren (package:flutter/src/widgets/framework.dart:4090:32)
#12     MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7060:17)
#13     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#14     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6907:14)
#15     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#16     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#17     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#18     StatelessElement.update (package:flutter/src/widgets/framework.dart:5693:5)
#19     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#20     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#21     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#22     StatelessElement.update (package:flutter/src/widgets/framework.dart:5693:5)
#23     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#24     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#25     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#26     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#27     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#28     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#29     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#30     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#31     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#32     Element.updateChildren (package:flutter/src/widgets/framework.dart:4090:32)
#33     MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7060:17)
#34     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#35     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#36     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#37     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#38     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#39     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#40     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#41     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#42     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#43     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#44     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#45     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#46     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#47     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#48     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#49     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#50     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#51     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#52     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#53     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#54     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#55     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#56     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#57     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#58     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6907:14)
#59     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#60     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#61     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#62     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#63     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#64     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6907:14)
#65     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#66     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#67     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#68     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#69     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#70     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#71     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#72     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#73     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#74     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#75     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#76     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#77     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#78     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#79     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#80     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#81     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#82     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#83     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#84     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#85     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#86     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#87     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#88     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#89     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#90     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#91     StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#92     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#93     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#94     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#95     ProxyElement.update (package:flutter/src/widgets/framework.dart:5946:5)
#96     Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#97     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#98     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#99     Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#100    StatefulElement.update (package:flutter/src/widgets/framework.dart:5803:5)
#101    Element.updateChild (package:flutter/src/widgets/framework.dart:3941:15)
#102    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5642:16)
#103    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#104    Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#105    BuildScope._tryRebuild (package:flutter/src/widgets/framework.dart:2693:15)
#106    BuildScope._flushDirtyElements (package:flutter/src/widgets/framework.dart:2752:11)
#107    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:3048:18)
#108    WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1162:21)
#109    RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:468:5)
#110    SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1397:15)
#111    SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1318:9)
#112    SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1176:5)
#113    _invoke (dart:ui/hooks.dart:312:13)
#114    PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5)
#115    _drawFrame (dart:ui/hooks.dart:283:31)
```

**Expected behaviour**
The toggle switch to show just one option on clicking of the button.

**Screenshots**
I hope the video recording below can explain the problem better.

https://github.com/user-attachments/assets/d3240bcc-b910-4445-8d12-ccc3f06c95d5

**Additional information**
- `toggle_switch` ^2.3.0
- `flutter doctor -v`
```
[✓] Flutter (Channel stable, 3.24.0, on macOS 14.6.1 23G93 darwin-arm64, locale en-AU)
    • Flutter version 3.24.0 on channel stable at /Users/imaduddin.mohammed/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 80c2e84975 (3 weeks ago), 2024-07-30 23:06:49 +0700
    • Engine revision b8800d88be
    • Dart version 3.5.0
    • DevTools version 2.37.2

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
    • Android SDK at /Users/imaduddin.mohammed/Library/Android/sdk
    • Platform android-35, build-tools 35.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)

[✓] VS Code (version 1.92.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.94.0

[✓] Connected device (4 available)
    • SM T630 (mobile)                • R52X505VPXF           • android-arm64  • Android 14 (API 34)
    • macOS (desktop)                 • macos                 • darwin-arm64   • macOS 14.6.1 23G93 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin         • macOS 14.6.1 23G93 darwin-arm64
    • Chrome (web)                    • chrome                • web-javascript • Google Chrome 128.0.6613.84

[✓] Network resources
    • All expected network resources are available.

• No issues found!
```
- I recently upgraded from Flutter 3.7.12, Dart 2.19.6 and toggle_switch ^1.4.0 and this issue was not present then.
- This happens on both Android and iOS if that helps.


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RangeError (length): Invalid value: Only valid value is 0: 1 on reducing label list size. #95

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RangeError (length): Invalid value: Only valid value is 0: 1 on reducing label list size. #95

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