Due to a quirk in the way forms are initialized, the review group form was

losing the "name" and "display name" fields before validation. This caused

saving new items to always fail.
Passing the local_site_name all the way through kwargs fixes the issue. I've

applied the same fix to the DefaultReviewerForm, and made both call the

superclass' clean method, just for completeness.

Was able to save new review groups and default reviewers.