Showing a Review throws an exception if there are no scores yet

(Bug, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Justin du Coeur, )
User Interface
Summary: This is surprisingly innocuous, but showed up in the Cooks Guild Space -- sometimes, the QLButton wouldn't render because the page was crashing before then.
Just a dumb little bug, which only showed up if there was additional rendering happening after the HistogramGadget.