TMSS-2541: fixed test

SAS/TMSS/backend/test/t_permissions_system_roles.py

@@ -61,6 +61,7 @@ from django.contrib.auth.models import Group
 from django.contrib.auth import get_user_model
 User = get_user_model()
 from lofar.sas.tmss.test.test_utils import set_subtask_state_following_allowed_transitions
+from lofar.common.json_utils import get_default_json_object_for_schema
 
 class SystemPermissionTestCase(unittest.TestCase):
     '''