audio: Raise error for unknown protocol types
audio: Raise error for unknown protocol types

jodal/mopidy,tkem/mopidy,diandiankan/mopidy,diandiankan/mopidy,quartz55/mopidy,hkariti/mopidy,ZenithDK/mopidy,rawdlite/mopidy,swak/mopidy,adamcik/mopidy,pacificIT/mopidy,dbrgn/mopidy,adamcik/mopidy,jcass77/mopidy,bencevans/mopidy,diandiankan/mopidy,kingosticks/mopidy,bacontext/mopidy,dbrgn/mopidy,pacificIT/mopidy,mopidy/mopidy,bacontext/mopidy,quartz55/mopidy,jcass77/mopidy,vrs01/mopidy,jmarsik/mopidy,glogiotatidis/mopidy,bencevans/mopidy,kingosticks/mopidy,hkariti/mopidy,bacontext/mopidy,dbrgn/mopidy,SuperStarPL/mopidy,tkem/mopidy,swak/mopidy,tkem/mopidy,jodal/mopidy,glogiotatidis/mopidy,jcass77/mopidy,quartz55/mopidy,mopidy/mopidy,bencevans/mopidy,diandiankan/mopidy,ali/mopidy,pacificIT/mopidy,ZenithDK/mopidy,ZenithDK/mopidy,hkariti/mopidy,jmarsik/mopidy,bacontext/mopidy,mokieyue/mopidy,mopidy/mopidy,ali/mopidy,SuperStarPL/mopidy,SuperStarPL/mopidy,swak/mopidy,adamcik/mopidy,quartz55/mopidy,dbrgn/mopidy,mokieyue/mopidy,kingosticks/mopidy,mokieyue/mopidy,ZenithDK/mopidy,glogiotatidis/mopidy,ali/mopidy,rawdlite/mopidy,glogiotatidis/mopidy,ali/mopidy,jodal/mopidy,jmarsik/mopidy,hkariti/mopidy,pacificIT/mopidy,vrs01/mopidy,mokieyue/mopidy,SuperStarPL/mopidy,vrs01/mopidy,vrs01/mopidy,bencevans/mopidy,jmarsik/mopidy,rawdlite/mopidy,tkem/mopidy,swak/mopidy,rawdlite/mopidy