Fix commands compatability with RB 1.6.x
Review Request #3884 — Created Feb. 18, 2013 and submitted
Fix commands compatability with RB 1.6.x Review Board 1.6.x does not provide a 'capabilities' field in the info resource which causes commands requiring it to fail. We now default the capabilities to be empty if they can't be found on the server.
Posted code before and after the fix to a 1.6.x server and confirmed the expected behaviour.