@Override
    public Void getResult() {
        return null;
    }
This task updates or deletes a property in a cluster node's muc service property map.
{@link org.jivesoftware.openfire.muc.spi.MUCServicePropertyEventListener} of each cluster node will be alerted of the event.

@author Daniel Henninger
xmppserver/src/main/java/org/jivesoftware/openfire/muc/cluster/MUCServicePropertyClusterEventTask.java