edit: add album query tests, revise failing ones
edit: add album query tests, revise failing ones

* Add tests for executing the command with album queries (-a), testing the edit
of album and albumartist fields.
* Revise invalid and malformed yaml tests so they return a failure instead of
an error.

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