Wikimedia Bugzilla is closed!

If there's only one version on a page, the history page still has the little "Compare selected verions" buttons at the top and bottom of the list. Of course, since there aren't multiple versions, there's no radio buttons to select revisions with.

Further, if you click the button, it just sends you to the page itself rather than any kind of diff.

The buttons probably should either be disabled or simply not displayed if we know we're outputting a single revision.