misc: declare an empty ou attribute in fake signature users (#62190)

hobo/rest_authentication.py

@@ -20,6 +20,7 @@ class AnonymousAuthenticServiceUser(AnonymousUser):
 
     is_anonymous = True
     is_authenticated = True
+    ou = None
 
     def has_perm(self, *args, **kwargs):
         return True
@@ -44,6 +45,7 @@ class AnonymousAdminServiceUser(AnonymousUser):
     is_staff = True
     is_anonymous = True
     is_authenticated = True
+    ou = None
 
     def __unicode__(self):
         return 'Publik Service Admin'