Comment 2 for bug 196496

You've linked to an inexistent or hidden report?

After a closer inspection ActionPkgPrepare.run (in /usr/bin/pycentral) doesn't seem to set default_runtime at all, so no surprise it's not set. Copying a couple of lines from another action seems to fix the problem. Attaching a patch (I don't have a good knowledge of python-central, so please check if that's actually the right thing to do before applying ;)