Throw if no audio string argument(s) passed.

Author: SnapperGee

app/src/main/java/sogott/tones/Main.java

@@ -51,6 +51,13 @@ public static void main(String[] args) {
                 System.out.println(
                         "No audio output specified (audible playback disabled and no file output selected). Exiting...");
             } else {
+                final List<String> operands = unmodifiableList(cliArgs.getArgList());
+
+                if(operands.isEmpty())
+                {
+                    throw new ParseException("No audio String argument(s) passed.");
+                }
+
                 final int bpm = cliArgs.getParsedOptionValue(CliOption.BPM.value(), BPM);
 
                 final int noteBeatValue = cliArgs.getParsedOptionValue(
@@ -63,8 +70,6 @@ public static void main(String[] args) {
 
                 final double wholeNoteDuration = beatDuration * noteBeatValue;
 
-                final List<String> operands = unmodifiableList(cliArgs.getArgList());
-
                 final record ValidAndInvalidOperands(List<Audio> valid, List<String> invalid) {
                 }