Updating Roles leads to problems, roles drop down is not populated

[mnorbeck]

Expected behavior:
Should be able to edit and update any role.

Actual behavior:
updating a role seems to make that role invalid.

Steps to reproduce:

1. Log in as a system admin
2. nav to user roles
3. select a role from the drop down
4. make a change to the role
5. click update
6. nav away from users roles
7. nav back to roles
8. select the role you just updated
9. role is missing from drop down list box and the list is gone.

This isa bit inconsistent, but more often than not the above will reproduce.

Screenshots (if applicable):

OS and Browser:
OSX Chrome 55.0.2883.75 64-bit