As a rapid board user with buggy browser extensions, I don't want exceptions thrown from extensions to break GreenHopper

GreenHopper appears to use a global exception handler that reacts to any uncaught exception by showing an error on the rapid board.

We've seen a couple of support requests from users with browser extensions that throw exceptions. In some cases, the errors may be benign and GreenHopper could continue to function normally, but the errors alarm people, and as a result they raise support requests.

This could potentially be caused by any JavaScript that runs within the context of the page: browser extensions, GreaseMonkey scripts, even JIRA plugins or Speakeasy extensions.