Last modified: 2013-02-26 20:58:57 UTC
Add {{subst:unc}} (the recommended way to flag media as needing categories). See https://commons.wikimedia.org/wiki/Template:Uncategorized Of course, actual category support would be great. But this is an interim solution that will at least make the people who add such metadata aware of the issue.
Fixed in df95f4791a7b46610edf4a9dd3ca77403782ce1d