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I expect <group op="=" value=""/> to match systems with no groups assigned and <group op="!=" value=""/> to match systems with a group assigned. Now it works just the opposite thanks to my faulty original implementation. We should switch this ASAP before people start using it, as it is breaking backward compatibility.
Change submitted to gerrit for review: http://beaker-gerrit.app.eng.bne.redhat.com/325
The change is online on beaker-stage.