Return nil when nil is passed in `Wiki#find_page`
What does this MR do and why?
Fixes Fix 5xx on /projects/:id/events (#506485 - closed)
Finding a page with nil title now returns nil, to be the least astonishing for developers.
This prevents raising errors in cases when the title passed to Wiki#find_page as an argument is nil, for example
when canonical_slug for a WikiPage::Meta record is nil because of bad state or for some other reason.
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