Return early when page id is less than 1

Wasteful DB query when we know the page won't exist.

Bug: 61166
Change-Id: I8943b4dec5088dadffefbd74f54653cb09043b7c
Remove undocumented and unused searchx parameter

It dates from early implementations of Special:Search but is
no longer used by anything anymore.

Change-Id: Ib6ed378242558aa332e453357510932310546f8b
Merge "Remove undocumented and unused searchx parameter"
Merge "Return early when page id is less than 1"