To Reproduce Steps to reproduce the behavior:

1. source overcloudrc

2. (overcloud) [stack@undercloud ~]$ openstack role assignment list --names
   Could not find domain: None. (HTTP 404) (Request-ID: req-38676a1e-134b-4507-9e9c-371306031fda)

Expected behavior

• To be able to use openstack role assignment list --names without it failing when there's no domain.

Device Info (please complete the following information):

• • Red Hat OpenStack Platform release 17.1.6 (Wallaby)

Additional context

• It works without --names.