fetchart: in auto, ignore albums with art
fetchart: in auto, ignore albums with art

When re-importing an album, we don't want fetchart to interfere
with any existing album art.

artemutin/beets,jmwatte/beets,jackwilsdon/beets,shamangeorge/beets,jcoady9/beets,artemutin/beets,mosesfistos1/beetbox,mosesfistos1/beetbox,LordSputnik/beets,jmwatte/beets,Freso/beets,jackwilsdon/beets,swt30/beets,lengtche/beets,MyTunesFreeMusic/privacy-policy,diego-plan9/beets,parapente/beets,lengtche/beets,kareemallen/beets,MyTunesFreeMusic/privacy-policy,ibmibmibm/beets,kareemallen/beets,MyTunesFreeMusic/privacy-policy,pkess/beets,mried/beets,kareemallen/beets,m-urban/beets,swt30/beets,mried/beets,beetbox/beets,diego-plan9/beets,pkess/beets,ibmibmibm/beets,m-urban/beets,lengtche/beets,xsteadfastx/beets,lengtche/beets,shamangeorge/beets,kelvinhammond/beets,jmwatte/beets,mosesfistos1/beetbox,Kraymer/beets,jmwatte/beets,madmouser1/beets,Freso/beets,artemutin/beets,Kraymer/beets,kareemallen/beets,m-urban/beets,kelvinhammond/beets,pkess/beets,sampsyo/beets,parapente/beets,pkess/beets,Kraymer/beets,mried/beets,mried/beets,madmouser1/beets,SusannaMaria/beets,Kraymer/beets,artemutin/beets,jackwilsdon/beets,parapente/beets,madmouser1/beets,jcoady9/beets,beetbox/beets,madmouser1/beets,jcoady9/beets,MyTunesFreeMusic/privacy-policy,diego-plan9/beets,SusannaMaria/beets,swt30/beets,m-urban/beets,sampsyo/beets,xsteadfastx/beets,ibmibmibm/beets,LordSputnik/beets,Freso/beets,jackwilsdon/beets,LordSputnik/beets,kelvinhammond/beets,parapente/beets,shamangeorge/beets,Freso/beets,beetbox/beets,sampsyo/beets,mosesfistos1/beetbox,kelvinhammond/beets,swt30/beets,SusannaMaria/beets,xsteadfastx/beets,sampsyo/beets,LordSputnik/beets,beetbox/beets,shamangeorge/beets,ibmibmibm/beets,xsteadfastx/beets,SusannaMaria/beets,jcoady9/beets,diego-plan9/beets