Description of problem:

How reproducible:

Always on develop branch

Is this issue a regression from an earlier version:

Probably.

Steps to Reproduce:

1. Go to the host edit form

2. Select the Operating System tab

3. Click on "x" in one of these selects:  Architecture, Operating system, Media or PXE loader 

4. Click update

5. Go back to the edit -> OS tab

See that nothing has been changed.

Actual behavior:
Removing options does nothing

Expected behavior:
Form validation works.

Business Impact / Additional info: