#31472: UserAdmin returns incorrect fieldsets when model has overridden __bool__
-------------------------------------+-------------------------------------
               Reporter:  krnr       |          Owner:  nobody
                   Type:  Bug        |         Status:  new
              Component:             |        Version:  master
  contrib.auth                       |       Keywords:  UserAdmin,
               Severity:  Normal     |  add_fieldsets, get_fieldsets
           Triage Stage:             |      Has patch:  1
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 in cases when model has "soft-delete" fields and defined `__bool__` like
 these:

 {{{
 class CustomUser(models.User):
     is_deleted = models.BooleanField(default=False)

     def __bool__(self):
         return not self.is_deleted
 }}}

 the `UserAdmin` will use `add_fieldsets` because of comparison in
 `get_fieldsets`.

 I have a simple fix for this: just check against `None` instead of boolean
 evaluation.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31472>
Django <https://code.djangoproject.com/>
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