MetaSync: Remove auto-discovery of sources
MetaSync: Remove auto-discovery of sources

In favor of simpler, hard-coded, list of sources, to avoid unneccesary magic.

Also: check to see if query has results before instantiating the meta sources

Dishwishy/beets,Andypsamp/CODfinalJUNIT,diego-plan9/beets,asteven/beets,PierreRust/beets,imsparsh/beets,tima/beets,jmwatte/beets,shanemikel/beets,marcuskrahl/beets,moodboom/beets,drm00/beets,ttsda/beets,randybias/beets,diego-plan9/beets,randybias/beets,YetAnotherNerd/beets,imsparsh/beets,beetbox/beets,kareemallen/beets,jcoady9/beets,ruippeixotog/beets,mosesfistos1/beetbox,shamangeorge/beets,mosesfistos1/beetbox,untitaker/beets,parapente/beets,madmouser1/beets,shamangeorge/beets,beetbox/beets,dfc/beets,Dishwishy/beets,swt30/beets,parapente/beets,marcuskrahl/beets,xsteadfastx/beets,Andypsamp/CODfinalJUNIT,swt30/beets,YetAnotherNerd/beets,artemutin/beets,Freso/beets,pkess/beets,Andypsamp/CODjunit,asteven/beets,SusannaMaria/beets,arabenjamin/beets,arabenjamin/beets,mried/beets,PierreRust/beets,jcoady9/beets,sadatay/beets,jackwilsdon/beets,jackwilsdon/beets,dfc/beets,Freso/beets,Kraymer/beets,randybias/beets,pkess/beets,SusannaMaria/beets,lightwang1/beets,imsparsh/beets,xsteadfastx/beets,jmwatte/beets,lightwang1/beets,Andypsamp/CODjunit,m-urban/beets,ttsda/beets,kareemallen/beets,moodboom/beets,sadatay/beets,lightwang1/beets,shanemikel/beets,moodboom/beets,sampsyo/beets,drm00/beets,xsteadfastx/beets,kareemallen/beets,mathstuf/beets,untitaker/beets,gabrielaraujof/beets,mried/beets,LordSputnik/beets,tima/beets,Kraymer/beets,diego-plan9/beets,ibmibmibm/beets,PierreRust/beets,YetAnotherNerd/beets,jcoady9/beets,lengtche/beets,lengtche/beets,beetbox/beets,shanemikel/beets,LordSputnik/beets,drm00/beets,gabrielaraujof/beets,m-urban/beets,kelvinhammond/beets,ttsda/beets,LordSputnik/beets,lightwang1/beets,shamangeorge/beets,parapente/beets,beetbox/beets,pkess/beets,kelvinhammond/beets,gabrielaraujof/beets,untitaker/beets,mathstuf/beets,PierreRust/beets,imsparsh/beets,mathstuf/beets,arabenjamin/beets,jmwatte/beets,xsteadfastx/beets,randybias/beets,Andypsamp/CODfinalJUNIT,Kraymer/beets,arabenjamin/beets,asteven/beets,kelvinhammond/beets,sadatay/beets,LordSputnik/beets,parapente/beets,Andypsamp/CODjunit,dfc/beets,shamangeorge/beets,kelvinhammond/beets,jackwilsdon/beets,tima/beets,dfc/beets,shanemikel/beets,gabrielaraujof/beets,lengtche/beets,MyTunesFreeMusic/privacy-policy,artemutin/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,swt30/beets,ruippeixotog/beets,Freso/beets,madmouser1/beets,kareemallen/beets,Dishwishy/beets,artemutin/beets,ibmibmibm/beets,artemutin/beets,Andypsamp/CODjunit,tima/beets,mried/beets,mathstuf/beets,ibmibmibm/beets,m-urban/beets,jcoady9/beets,Freso/beets,sampsyo/beets,marcuskrahl/beets,ibmibmibm/beets,mried/beets,swt30/beets,lengtche/beets,ttsda/beets,drm00/beets,jmwatte/beets,ruippeixotog/beets,Andypsamp/CODfinalJUNIT,jackwilsdon/beets,moodboom/beets,SusannaMaria/beets,sampsyo/beets,SusannaMaria/beets,ruippeixotog/beets,YetAnotherNerd/beets,madmouser1/beets,diego-plan9/beets,marcuskrahl/beets,untitaker/beets,Andypsamp/CODjunit,Kraymer/beets,Dishwishy/beets,asteven/beets,Andypsamp/CODfinalJUNIT,m-urban/beets,sadatay/beets,pkess/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,madmouser1/beets,MyTunesFreeMusic/privacy-policy,sampsyo/beets