Log track exceptions in the audio handler (jagrosh#1558)

src/main/java/com/jagrosh/jmusicbot/audio/AudioHandler.java

@@ -20,8 +20,10 @@
 import com.jagrosh.jmusicbot.settings.QueueType;
 import com.jagrosh.jmusicbot.utils.TimeUtil;
 import com.jagrosh.jmusicbot.settings.RepeatMode;
+import com.jagrosh.jmusicbot.utils.OtherUtil;
 import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
 import com.sedmelluq.discord.lavaplayer.player.event.AudioEventAdapter;
+import com.sedmelluq.discord.lavaplayer.tools.FriendlyException;
 import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
 import com.sedmelluq.discord.lavaplayer.track.AudioTrackEndReason;
 import com.sedmelluq.discord.lavaplayer.track.playback.AudioFrame;
@@ -40,6 +42,7 @@
 import net.dv8tion.jda.api.entities.Guild;
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.entities.User;
+import org.slf4j.LoggerFactory;
 
 /**
  *
@@ -199,6 +202,11 @@ public void onTrackEnd(AudioPlayer player, AudioTrack track, AudioTrackEndReason
         }
     }
 
+    @Override
+    public void onTrackException(AudioPlayer player, AudioTrack track, FriendlyException exception) {
+        LoggerFactory.getLogger("AudioHandler").error("Track " + track.getIdentifier() + " has failed to play", exception);
+    }
+
     @Override
     public void onTrackStart(AudioPlayer player, AudioTrack track) 
     {