When the base model also serves as child model, the flow no longer points to the child admin, but returns `self` instead. Either every user of `_get_real_admin()` should detect this, or we return the super method as convenience.
When the base model also serves as child model, the flow no longer points to the child admin, but returns `self` instead. Either every user of `_get_real_admin()` should detect this, or we return the super method as convenience.