Unique checks in model formsets do not ignore null values
|Reported by:||Claude Paroz||Owned by:||nobody|
|Has patch:||yes||Needs documentation:|
|Needs tests:||Patch needs improvement:|
When you have unique_together constraints in which one member can be null, the constraint should not be enforced (as it is correctly done at the model level). Unfortunately, this fails at the formset validation. I think this is a regression in 1.2.