LPS-41846 Hitting not-existing site should show not found, redirects instead

Hi Brian,

I performed a refactor and added a unit test, according to your previous comment: https://github.com/brianchandotcom/liferay-portal/pull/15086#issuecomment-28032095

Have you been thinking about something like this? I ended up removing that property, because at a second sight it didn't make sense indeed.

Cheers,
László