Currently, WikiPageConfigLoader::load will return an error if the configuration page does not exist. In the two usages we have for WikiPageConfigLoader, this can have two implications:

• In the community configuration, everything will be configured based on what the PHP globals say
• In the structured mentor list, mentorship would behave just as if there were no mentors listed at all.

In both cases, this is precisely what happens if WikiPageConfigLoader::load returned an empty array, instead of failing.

I think we should make WikiPageConfigLoader::load simply return an empty array in this case, as the end result would be the same.