OSIS-6419 : fix osis-role

Author: BenJneB

osis_role/contrib/models.py

@@ -90,7 +90,7 @@ def _add_user_to_group(self):
             pass
 
     def _remove_user_from_group(self, person):
-        if not self.belong_to(person):
+        if not self.belong_to(person) and person.user:
             group, _ = Group.objects.get_or_create(name=self.group_name)
             person.user.groups.remove(group)