Fix null sort broken by b1c58e9
Fix null sort broken by b1c58e9

mosesfistos1/beetbox,madmouser1/beets,xsteadfastx/beets,pkess/beets,MyTunesFreeMusic/privacy-policy,xsteadfastx/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,madmouser1/beets,beetbox/beets,lengtche/beets,beetbox/beets,artemutin/beets,Freso/beets,jackwilsdon/beets,artemutin/beets,SusannaMaria/beets,artemutin/beets,pkess/beets,lengtche/beets,diego-plan9/beets,Freso/beets,diego-plan9/beets,jcoady9/beets,jcoady9/beets,shamangeorge/beets,jackwilsdon/beets,lengtche/beets,diego-plan9/beets,SusannaMaria/beets,mosesfistos1/beetbox,beetbox/beets,diego-plan9/beets,jcoady9/beets,sampsyo/beets,sampsyo/beets,pkess/beets,Freso/beets,mosesfistos1/beetbox,Kraymer/beets,Kraymer/beets,ibmibmibm/beets,sampsyo/beets,Kraymer/beets,SusannaMaria/beets,Freso/beets,mosesfistos1/beetbox,ibmibmibm/beets,shamangeorge/beets,MyTunesFreeMusic/privacy-policy,xsteadfastx/beets,SusannaMaria/beets,sampsyo/beets,beetbox/beets,lengtche/beets,shamangeorge/beets,shamangeorge/beets,Kraymer/beets,ibmibmibm/beets,artemutin/beets,madmouser1/beets,MyTunesFreeMusic/privacy-policy,jackwilsdon/beets,ibmibmibm/beets,jcoady9/beets,madmouser1/beets,xsteadfastx/beets,pkess/beets