fixed return type coersion for list command
fixed return type coersion for list command

--HG--
extra : convert_revision : svn%3A41726ec3-264d-0410-9c23-a9f1637257cc/trunk%40189

ibmibmibm/beets,YetAnotherNerd/beets,pkess/beets,ngokevin/beets,Dishwishy/beets,beetbox/beets,mried/beets,mosesfistos1/beetbox,swt30/beets,LordSputnik/beets,dfc/beets,PierreRust/beets,m-urban/beets,Andypsamp/CODfinalJUNIT,bj-yinyan/beets,mathstuf/beets,krig/beets,diego-plan9/beets,diego-plan9/beets,Andypsamp/CODjunit,bj-yinyan/beets,sadatay/beets,MyTunesFreeMusic/privacy-policy,jbaiter/beets,asteven/beets,Kraymer/beets,artemutin/beets,ruippeixotog/beets,mathstuf/beets,asteven/beets,m-urban/beets,kareemallen/beets,Andypsamp/CODjunit,marcuskrahl/beets,diego-plan9/beets,shanemikel/beets,shanemikel/beets,imsparsh/beets,jmwatte/beets,krig/beets,pdf/beets,Andypsamp/CODfinalJUNIT,Freso/beets,moodboom/beets,multikatt/beets,LordSputnik/beets,beetbox/beets,andremiller/beets,jackwilsdon/beets,jmwatte/beets,aspidites/beets,Dishwishy/beets,beetbox/beets,ibmibmibm/beets,parapente/beets,ttsda/beets,ibmibmibm/beets,jayme-github/beets,YetAnotherNerd/beets,moodboom/beets,pkess/beets,imsparsh/beets,swt30/beets,MyTunesFreeMusic/privacy-policy,sampsyo/beets,parapente/beets,jcoady9/beets,shanemikel/beets,Freso/beets,mclearc/beets,Andypsamp/CODfinalJUNIT,gabrielaraujof/beets,Andypsamp/CODjunit,Kraymer/beets,parapente/beets,PierreRust/beets,shamangeorge/beets,beetbox/beets,lengtche/beets,Kraymer/beets,drm00/beets,mried/beets,asteven/beets,andremiller/beets,drm00/beets,tima/beets,PierreRust/beets,SusannaMaria/beets,krig/beets,marcuskrahl/beets,kelvinhammond/beets,xsteadfastx/beets,Andypsamp/CODjunit,randybias/beets,marcuskrahl/beets,YetAnotherNerd/beets,jcoady9/beets,shamangeorge/beets,tima/beets,ruippeixotog/beets,xsteadfastx/beets,sadatay/beets,madmouser1/beets,Andypsamp/CODfinalJUNIT,lengtche/beets,artemutin/beets,gabrielaraujof/beets,MyTunesFreeMusic/privacy-policy,lightwang1/beets,randybias/beets,kelvinhammond/beets,mclearc/beets,mosesfistos1/beetbox,jbaiter/beets,sampsyo/beets,jackwilsdon/beets,tima/beets,shanemikel/beets,swt30/beets,bj-yinyan/beets,Wen777/beets,multikatt/beets,gabrielaraujof/beets,jackwilsdon/beets,multikatt/beets,artemutin/beets,arabenjamin/beets,mathstuf/beets,untitaker/beets,lightwang1/beets,marcuskrahl/beets,Freso/beets,arabenjamin/beets,multikatt/beets,ttsda/beets,andremiller/beets,lightwang1/beets,m-urban/beets,kareemallen/beets,tima/beets,mclearc/beets,lightwang1/beets,ttsda/beets,gabrielaraujof/beets,moodboom/beets,dfc/beets,jmwatte/beets,Kraymer/beets,randybias/beets,shamangeorge/beets,Dishwishy/beets,madmouser1/beets,jayme-github/beets,diego-plan9/beets,jcoady9/beets,xsteadfastx/beets,drm00/beets,ruippeixotog/beets,SusannaMaria/beets,Wen777/beets,untitaker/beets,arabenjamin/beets,mosesfistos1/beetbox,mried/beets,Dishwishy/beets,imsparsh/beets,untitaker/beets,ruippeixotog/beets,asteven/beets,randybias/beets,kareemallen/beets,lengtche/beets,kelvinhammond/beets,dfc/beets,pdf/beets,Andypsamp/CODfinalJUNIT,parapente/beets,artemutin/beets,dfc/beets,Freso/beets,madmouser1/beets,bj-yinyan/beets,SusannaMaria/beets,sadatay/beets,imsparsh/beets,LordSputnik/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,mathstuf/beets,kareemallen/beets,arabenjamin/beets,xsteadfastx/beets,drm00/beets,moodboom/beets,jcoady9/beets,mosesfistos1/beetbox,sadatay/beets,kelvinhammond/beets,Andypsamp/CODjunit,pkess/beets,PierreRust/beets,mried/beets,pkess/beets,m-urban/beets,madmouser1/beets,lengtche/beets,SusannaMaria/beets,ibmibmibm/beets,sampsyo/beets,ttsda/beets,jmwatte/beets,sampsyo/beets,ngokevin/beets,swt30/beets,shamangeorge/beets,Wen777/beets,untitaker/beets,aspidites/beets,YetAnotherNerd/beets,LordSputnik/beets