undefined method `new_project_guidelines_html', unable to load from cache
Running 10.2.4+rnightly.69192.5f1f005d-0 on a testbed that has an existing cache entry for Appearance fails because this method is not in the cache.
500 error: https://sentry.gitlap.com/gitlab/geo1/issues/113915/
more context: https://gitlab.slack.com/archives/C02PF508L/p1513074674000180
To work around this I needed to flush the cache:
Appearance.current.flush_redis_cache