Comment 13 for bug 833058

I think the problem is that even with the 'fix' there is no hard dependency on polkit-kde-1.

Let's look at it logically:
Muon is specifically designed to run on the desktops of unprivileged users and update their systems. To do that it needs root privileges and to get those it needs a mechanism to ask the user to authorise it to run as root.

Therefore having polkit-kde-1 installed is necessary for Muon to function properly, so it should be a hard dependency not a 'recommends' or anything else.