can end up in a situation that other role/s, assigned to the group, is/are suddenly showed up as uuids, not as names.

To reproduce:

1. create a test role
2. create a test group, assign roles in this order: test, demo-project-base, contact-base, workflow-base, demo-project-publisher. Save.
3. delete the test role, edit the test group and you should see something similar to attached roles.png
   
   The same behavior affects also the rest of possible assignments - Groups for Group and Groups for User.