I guess I don't really have time to redesign the interface for product linking, so I inserted a hack that should make things display better:
If an album has a distributor linked, but no publisher, then I take the contents of the publisher field and remove everything from the first "(" onward. Then, I tack on the distributor string. It works nicely for the Bandcamp albums:
http://vgmdb.net/album/33593
One thing that will derail this is if the unlinked publisher name has a "(" in it, but I hope none do.