Issue:Namespace = foo OR bar not working

Description:	namespace = foo OR is not working?
Extension / Version:	DPL   /   1.8.6
Type / Status:	Bug   /   open

Problem

Image:Cookie.jpg is used on: Muha Test, Category:Test Images and User:Subfader/Z. Now lets return those 3 as page links according to Namespace#namespace:
Code

{{#dpl:
|debug=0
|namespace=User||Category
|imageused=Cookie.jpg
|count=1
|format=,[[%PAGE%]],,
}}

Result:

Extension:DynamicPageList (DPL), version 3.2.1: Warning: No parameter option supplied for 'Category'. (Missing '=')

User:Subfader

Note: I tried all variations for namespace=User||Category, but either it returns an error when '' is used for Main only the last is considered on namespace=User|Category. Same for "category=Test Images" instead og imageused=Cookie.jpg.

You can also test your own examples from the manual like

<DPL>
  category=Policy
  namespace=Wikinews|Discussion
</DPL>

Result: