Issue:Undesired vertical bar inserted in userformat mode output.

Description:	Undesired vertical bar inserted in userformat mode output.
Extension / Version:	DPL   /   1.7.4
Type / Status:	Bug   /   open

Problem

My wiki has pages with templates with templates such as the following:

{{mytemplate
|parm1=parm1value
|parm2=parm2value
|parm3=parm3value
}}

I am attempting to generate a list of all uses of 'mytemplate' where parm1 = parmvalue1. I want the list to display the values of two other parameters of the template with separators that I can specify using other parameters. I'm attempting to use the following query:

{{#dpl:
|uses=Template:mytemplate
|mode=userformat
|includematch=/\s*parm1\s*=\s*parm1value/s
|includepage={mytemplate}:parm2:parm3
}}

I want it to give me the following output:

parm2valueparm3value

...and then let me specify what separators to put between them.

However, the query produces the following output:

parm2value
|parm3value

The code in includeTemplate() is inserting a vertical bar and newline into the output, apparently presuming that the output is being used to form a template call. But when I specify mode=userformat, I don't want DPL to add any formatting; I want to do that myself.