Description of problem:
Create a hostgroup with a KS repository and save. Go to edit it and notice the ks group is not displayed (even though it is in the database)

Version-Release number of selected component (if applicable):
6.15,6.14 (might be in 6.13 also...)

How reproducible: always

Steps to Reproduce:
1. Sync a kickstart repository ks-zoo (I synced => https://partha.fedorapeople.org/test-repos/kickstart-zoo/)
2. Create a hostgroup with Library/Default Org View/x86_64/Redhat-7/ks-zoo in synced content.
3. Save the hostgroup
4. Click on the hostgroup again and go to Operating System tab

Actual results:
Notice that Synced Content is not populated

Expected results:
Synced Content should be showing ks-zoo

Additional info:

If you looked at the content facet of the host group in rails console you clearly see that the KS repo is actually set. Its just not populated in the dropdown

QE Tracker for https://issues.redhat.com/browse/SAT-23487
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2265396