core: Turn AlbumArt lookup condition into requirement
core: Turn AlbumArt lookup condition into requirement

GNOME/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,Tarnyko/rygel,luisbg/rygel,jku/rygel,Tarnyko/rygel,GNOME/rygel