Avoid endless loop if all tracks are unplayable.
Avoid endless loop if all tracks are unplayable.

Limit the number of tries for changing to the nest track.
The limit is 2 * tracklist length get all tracks in a shuffled playlist.

jcass77/mopidy,mopidy/mopidy,mopidy/mopidy,vrs01/mopidy,jcass77/mopidy,jodal/mopidy,ZenithDK/mopidy,kingosticks/mopidy,mopidy/mopidy,adamcik/mopidy,kingosticks/mopidy,jcass77/mopidy,kingosticks/mopidy,ZenithDK/mopidy,ZenithDK/mopidy,vrs01/mopidy,jodal/mopidy,vrs01/mopidy,jodal/mopidy,adamcik/mopidy,vrs01/mopidy,adamcik/mopidy,ZenithDK/mopidy