Not able to print parameter values in BIP report, using if condition in Excel rtf template

Using if condition in excel template had validated values if parameter is null , should return all as values selected is ALL, see below

<xsl:if test=".//P_WORDER=''">All</xsl:if>

But when i am populating specific values in the report those are not getting print in the output, can someone let me know any other condition is getting missed here?