Fix dummy backend implementation
Fix dummy backend implementation

jodal/mopidy,jcass77/mopidy,jcass77/mopidy,kingosticks/mopidy,kingosticks/mopidy,mopidy/mopidy,mopidy/mopidy,jodal/mopidy,jcass77/mopidy,kingosticks/mopidy,mopidy/mopidy,jodal/mopidy