Tentative fix for issue 2734: also check for RETAG
Tentative fix for issue 2734: also check for RETAG

ibmibmibm/beets,sampsyo/beets,beetbox/beets,jackwilsdon/beets,SusannaMaria/beets,beetbox/beets,shamangeorge/beets,sampsyo/beets,ibmibmibm/beets,jackwilsdon/beets,jackwilsdon/beets,ibmibmibm/beets,beetbox/beets,sampsyo/beets,SusannaMaria/beets,sampsyo/beets,ibmibmibm/beets,jackwilsdon/beets,shamangeorge/beets,shamangeorge/beets,SusannaMaria/beets,SusannaMaria/beets,beetbox/beets,shamangeorge/beets