Stopping a recording immediately after starting it throws multiple exceptions on Android

[mschudt]

This bug happened when calling stop immediately after start (few hundred milliseconds max).
Fixed this by catching the RuntimeException from the MediaRecorder stop call and returning null for path and -1 for duration.

E/flutter ( 9041): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(error, null, null, java.lang.IllegalStateException
E/flutter ( 9041): 	at android.media.MediaRecorder.getMaxAmplitude(Native Method)
E/flutter ( 9041): 	at com.simform.audio_waveforms.AudioRecorder.getDecibel(AudioRecorder.kt:35)
E/flutter ( 9041): 	at com.simform.audio_waveforms.AudioWaveformsPlugin.onMethodCall(AudioWaveformsPlugin.kt:68)
E/flutter ( 9041): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:258)
E/flutter ( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/flutter ( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/flutter ( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter ( 9041): 	at android.os.Handler.handleCallback(Handler.java:942)
E/flutter ( 9041): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter ( 9041): 	at android.os.Looper.loopOnce(Looper.java:240)
E/flutter ( 9041): 	at android.os.Looper.loop(Looper.java:351)
E/flutter ( 9041): 	at android.app.ActivityThread.main(ActivityThread.java:8423)
E/flutter ( 9041): 	at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 9041): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
E/flutter ( 9041): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)
E/flutter ( 9041): )

E/MediaRecorder( 9041): getMaxAmplitude called in an invalid state: 32
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): Failed to handle method call
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): java.lang.IllegalStateException
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.media.MediaRecorder.getMaxAmplitude(Native Method)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at com.simform.audio_waveforms.AudioRecorder.getDecibel(AudioRecorder.kt:35)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at com.simform.audio_waveforms.AudioWaveformsPlugin.onMethodCall(AudioWaveformsPlugin.kt:68)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:258)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.os.Handler.handleCallback(Handler.java:942)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.os.Looper.loopOnce(Looper.java:240)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.os.Looper.loop(Looper.java:351)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at android.app.ActivityThread.main(ActivityThread.java:8423)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
E/MethodChannel#simform_audio_waveforms_plugin/methods( 9041): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)