'Verify that adding an empty list of users to a cohort has no result.'

def test_empty(self):

    response_dict = self.request_add_users_to_cohort('', self.cohort1, self.course)
    self.verify_added_users_to_cohort(response_dict, self.cohort1, self.course, expected_added=[], expected_changed=[], expected_present=[], expected_preassigned=[], expected_unknown=[], expected_invalid=[])
