If an add relationship edit is cancelled, any cover art it provided should be removed (and if there's another cover art link that can be used, it should use that)
This is now available for testing on http://test.musicbrainz.org
This does not appear to be working on test for one reason or another.
Both rejecting in http://test.musicbrainz.org/edit/14841071 and cancelling http://test.musicbrainz.org/edit/14841072 lead to the edit being "Error: This edit failed due to an internal error and may need to be entered again." which is even worse?
Indeed, that doesn't sound good! I can't reproduce it here, but I'll explore more tomorrow when I'm back at work.
Ok, this has been fixed. There was a tiny little bug when removing the very last CA relationship for releases that didn't have a barcode, and it seems that wasn't in my test cases. This should be working now!
Looks good now. Does the barcode affect it somehow? Didn't really even consider that!
Yea, we now use barcodes to lookup Amazon cover art too