Recover from any Pygments errors.
Recover from any Pygments errors.

Recover from any Pygments errors. On my RB installation I have occasionally seen
errors from Pygments that weren't caught and led to stack dumps.  This catches
those, insulating ReviewBoard from any Pygments issues.

Testing done: This has been running on my instance for many months, and
thousands of reviews have been created.

Reviewed at http://reviews.reviewboard.org/r/2192/

chipx86/reviewboard,davidt/reviewboard,chazy/reviewboard,1tush/reviewboard,Khan/reviewboard,atagar/ReviewBoard,KnowNo/reviewboard,reviewboard/reviewboard,atagar/ReviewBoard,Khan/reviewboard,atagar/ReviewBoard,Khan/reviewboard,reviewboard/reviewboard,chazy/reviewboard,KnowNo/reviewboard,Khan/reviewboard,bkochendorfer/reviewboard,custode/reviewboard,reviewboard/reviewboard,1tush/reviewboard,custode/reviewboard,1tush/reviewboard,davidt/reviewboard,brennie/reviewboard,Khan/reviewboard,bkochendorfer/reviewboard,sgallagher/reviewboard,chazy/reviewboard,sgallagher/reviewboard,beol/reviewboard,atagar/ReviewBoard,chazy/reviewboard,brennie/reviewboard,chipx86/reviewboard,davidt/reviewboard,chazy/reviewboard,chazy/reviewboard,beol/reviewboard,chazy/reviewboard,chipx86/reviewboard,1tush/reviewboard,atagar/ReviewBoard,1tush/reviewboard,atagar/ReviewBoard,1tush/reviewboard,KnowNo/reviewboard,brennie/reviewboard,atagar/ReviewBoard,Khan/reviewboard,chazy/reviewboard,atagar/ReviewBoard,Khan/reviewboard,bkochendorfer/reviewboard,sgallagher/reviewboard,custode/reviewboard,sgallagher/reviewboard,atagar/ReviewBoard,1tush/reviewboard,bkochendorfer/reviewboard,Khan/reviewboard,chipx86/reviewboard,beol/reviewboard,1tush/reviewboard,KnowNo/reviewboard,brennie/reviewboard,custode/reviewboard,chazy/reviewboard,reviewboard/reviewboard,davidt/reviewboard,Khan/reviewboard,1tush/reviewboard,beol/reviewboard