Send 404 in various special pages when there're no results

Bug: 67182
Change-Id: I442645d8b98731282768e6cc19a8f426b1d0b519
Break some long lines in maintenance, skins, tests

Change-Id: I5d86ad3e0c90e09440268a670f5af3e2bf080612
Merge "Break some long lines in maintenance, skins, tests"
Merge "Send 404 in various special pages when there're no results"