Error page for "Permission to access issue denied" is blank page.
This is related to the feature request of a "Go to issue" form. If I go to /issues/show/123 and I don't have
access to the project that has issue 123, then I get a blank white page instead of an error message.
Again, I don't know enough rails to handle what happens, but I suppose it's somewhere in the before_filter ... :authorize,
and what happens when it fails.