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Ensure orderby is allways an array

Authored by Lokal_Profil on Oct 24 2016, 3:02 PM.

Description

Ensure orderby is allways an array

Since the later test checks if($orderby) an empty array servs us
better than a bool.

Also fix contradiction in documentation for bbox.

Bug: T148773
Bug: T148772
Change-Id: I610fa75039f37ac313fef79e16873899764fa8aa