core: Update tests with cases for filtering out None results.
core: Update tests with cases for filtering out None results.

woutervanwijk/mopidy,ali/mopidy,ZenithDK/mopidy,mopidy/mopidy,pacificIT/mopidy,jmarsik/mopidy,bencevans/mopidy,quartz55/mopidy,bencevans/mopidy,mokieyue/mopidy,vrs01/mopidy,adamcik/mopidy,jodal/mopidy,SuperStarPL/mopidy,ZenithDK/mopidy,vrs01/mopidy,ali/mopidy,mokieyue/mopidy,quartz55/mopidy,kingosticks/mopidy,ali/mopidy,jmarsik/mopidy,liamw9534/mopidy,tkem/mopidy,jmarsik/mopidy,swak/mopidy,mopidy/mopidy,dbrgn/mopidy,bencevans/mopidy,ZenithDK/mopidy,liamw9534/mopidy,adamcik/mopidy,pacificIT/mopidy,quartz55/mopidy,priestd09/mopidy,kingosticks/mopidy,dbrgn/mopidy,dbrgn/mopidy,swak/mopidy,adamcik/mopidy,bacontext/mopidy,vrs01/mopidy,rawdlite/mopidy,SuperStarPL/mopidy,mokieyue/mopidy,mokieyue/mopidy,hkariti/mopidy,abarisain/mopidy,diandiankan/mopidy,woutervanwijk/mopidy,tkem/mopidy,mopidy/mopidy,bacontext/mopidy,ZenithDK/mopidy,bacontext/mopidy,quartz55/mopidy,priestd09/mopidy,vrs01/mopidy,jcass77/mopidy,tkem/mopidy,kingosticks/mopidy,jmarsik/mopidy,jcass77/mopidy,rawdlite/mopidy,jodal/mopidy,hkariti/mopidy,bacontext/mopidy,abarisain/mopidy,pacificIT/mopidy,swak/mopidy,hkariti/mopidy,ali/mopidy,glogiotatidis/mopidy,jodal/mopidy,rawdlite/mopidy,glogiotatidis/mopidy,SuperStarPL/mopidy,pacificIT/mopidy,bencevans/mopidy,priestd09/mopidy,hkariti/mopidy,glogiotatidis/mopidy,swak/mopidy,diandiankan/mopidy,jcass77/mopidy,dbrgn/mopidy,diandiankan/mopidy,glogiotatidis/mopidy,rawdlite/mopidy,SuperStarPL/mopidy,tkem/mopidy,diandiankan/mopidy