Description of problem:

When uploading a configuration file from a client which has selinux disabled and is registered to Spacewalk, rhn_check returns a Python error stating that it cannot marshal None unless allow_none is enabled.

Version-Release number of selected component (if applicable):

rhncfg-5.10.73-1.el6.noarch

How reproducible:

Easily.

Steps to Reproduce:
1. Select a system with selinux disabled from the Spacewalk server
2. Upload a config file from that system
3. Wait for osad to trigger rhn_check or run it manually

Actual results:

Python produces the error described above.

Expected results:

Config file is uploaded into the system's sandbox.

Additional info:

Please see this thread: https://www.redhat.com/archives/spacewalk-list/2014-August/msg00036.html