allow no-sound mode in case of audio player creation error

asset/player.go

@@ -21,7 +21,11 @@ func NewAudioPlayer() *AudioPlayer {
 
 	player, err := oto.NewPlayer(44100, 2, 2, 8192)
 	if err != nil {
-		panic(err)
+		// it is expected to fail when some of the system
+		// libraries are not available (e.g. libasound2)
+		// it is not the main functionality of the application,
+		// so we allow startup in no-sound mode
+		return nil
 	}
 
 	return &AudioPlayer{

data/trigger.go

@@ -74,7 +74,7 @@ func (t *Trigger) Execute(sample *Sample) {
 			fmt.Print(console.BellCharacter)
 		}
 
-		if t.actions.sound {
+		if t.actions.sound && t.player != nil {
 			t.player.Beep()
 		}
 

main.go

@@ -84,7 +84,9 @@ func main() {
 	defer console.Close()
 
 	player := asset.NewAudioPlayer()
-	defer player.Close()
+	if player != nil {
+		defer player.Close()
+	}
 
 	defer handleCrash(statistics, opt, bc)
 	defer updateStatistics(cfg, time.Now())