So, replace it with something else.
old: <xsl:variable name="JDFJob_ID" select="//JobID"/>
new: <xsl:variable name="JDFJob_ID" select="//Sqls/StoreName/Row/StoreName"/>
If you don't want storename, put some other field in there.
If you want it empty, remove the select="" parameter: <xsl:variable name="JDFJob_ID" />