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Gracefully handle errors in syntax highlighting by leaving the block unformatted

Stan Hu requested to merge stanhu/gitlab-ce:rescue-syntax-highlighting-errors into master

A bug in Rouge caused an Exception:

undefined method `sub' for :Literal:Symbol

That caused embeddable-common-lisp/ecl#156 (closed) to hit Error 500 and fail to display. If a failure occurs, just render the text as preformatted.

Closes #2433 (closed)

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