fix: update heading condition check in Alert component

Author: athphane

resources/views/bootstrap-5/alert.blade.php

@@ -11,15 +11,15 @@
         <div class="d-flex align-items-start">
             <i class="{{ $icon }} flex-shrink-0 me-2" aria-hidden="true"></i>
             <div class="flex-grow-1">
-                @isset($heading)
+                @if(isset($heading) && $heading)
                     <h4 class="alert-heading">{{ $heading }}</h4>
                 @endisset
 
                 {!! $slot !!}
             </div>
         </div>
     @else
-        @isset($heading)
+        @if(isset($heading) && $heading)
             <h4 class="alert-heading">{{ $heading }}</h4>
         @endisset
 

resources/views/material-admin-26/alert.blade.php

@@ -11,15 +11,15 @@
         <div class="d-flex align-items-start">
             <i class="{{ $icon }} flex-shrink-0 me-2" aria-hidden="true"></i>
             <div class="flex-grow-1">
-                @isset($heading)
+                @if(isset($heading) && $heading)
                     <h4 class="alert-heading">{{ $heading }}</h4>
                 @endisset
 
                 {!! $slot !!}
             </div>
         </div>
     @else
-        @isset($heading)
+        @if(isset($heading) && $heading)
             <h4 class="alert-heading">{{ $heading }}</h4>
         @endisset