CDD-2432 Adds permission models - set permissions default

tests/factories/metrics/rbac_models/rbac_group_permissions.py

@@ -23,6 +23,7 @@ def create_record(
         permissions: list[RBACPermission] | None = None,
         **kwargs,
     ):
+        permissions = permissions or []
 
         group = cls.create(name=name, **kwargs)
         # Fetch or create permissions and add them to the group