Fallback forwarding

[kevindeyne]

If you hit a known URL in Hydra which went offline, you should not hit a 404 if possible but be redirected to a previous page/main page. I'm not sure yet if this fully makes sense, but consider the following usecase:

Dynamic menu, 2 instances: /store and /profile
From the /store you click on /profile
/profile just went down
Giving a 404 at that point would be odd? Maybe just redirect to /store, where the /profile option would be gone