discogs: Better exception logging
discogs: Better exception logging

Might have helped diagnose #1669 more easily.

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