1060866 - The Repository Group Distributors API is now documented

https://bugzilla.redhat.com/show_bug.cgi?id=1060866
We should (almost) never document that a specific call might return a 500. In this case, if a 500 is returned, we have failed to handle an error condition in a graceful manner.

Is there something specific in the code that deliberately returns a 500? Or are we documenting this "just in case"?