etianen/django-reversion — pull request #290 by daaray (2014-02-26 20:16:08+00:00)
Title: [289] Preserve deleted User revisions

Fixes #289

* Sets ```Revision.user.on_delete``` to ```SET_NULL```
* adds test to ensure Revision is preserved
* Adjusts ```object_history.html``` template to provide hint as to why User not found