[Fixed] no longer plays sound when noone in channel

app/src/main/java/de/yannicpunktdee/yoshibot/listeners/DiscordEventListener.java

@@ -87,6 +87,7 @@ public class DiscordEventListener extends ListenerAdapter {
 			String nameToPlay = event.getMember().getNickname();
 			nameToPlay = nameToPlay == null ? event.getMember().getUser().getName() : nameToPlay;
 			
+			if (event.getChannelLeft().getMembers().size() == 0) return;
 			YoshiBot.getInstance().sayTTS(Resources.getRandomByebye(nameToPlay), event.getChannelLeft());
 		}
 		if (!AudioPlayerListener.isPlayingTrack()) YoshiBot.getInstance().joinVoiceChannelWithMostMembers();