When calling MyModel.objects.filter(Q(...)), an extra wrapper Q()

sometimes gets generated, resulting in an expression like

Q(Q(field=value)). This is annoying to work with in tests, and feels

wrong.
To avoid this, we now post-process just a bit. If the Q() object

contains only one child, and that child is another Q() object, we just

extract the inner one.

Tested with unit tests that were triggering this behavior.