The the "otherwise" block works but not the "when" block.

<xsl:template match="/">
<!-- Creating ID of the Menu Container -->
  <xsl:variable name="id" select="$currentPage/corMenuItemsID" />
  <ul>
   <!--- Getting the Menu Items in the Container-->
  <xsl:for-each select="umbraco.library:GetXmlNodeById($id)/corDeptMenuItem [@isDoc]">
    <!-- Setting variable to get the URL from below property -->
    <xsl:variable name="theURL" select="umbraco.library:NiceUrl(corDeptMenuItemLink)" />
    <!-- Setting variable to get the text value from below property -->
    <xsl:variable name="corURLValue" select="umbraco.library:Item($currentPage/@id, 'corURL')" />
    <xsl:choose>
      <!-- if the value of the corDeptMenuItemLink is null or "" output the value of corURL property-->
      <xsl:when test="theURL = ''">
        <li>
          <a href="corURLValue">
            <xsl:value-of select="@nodeName"/>
          </a>
        </li>
      </xsl:when>
      <!-- otherwise output the URL of the value of the URL of the corDeptMenuItemLink property-->
      <xsl:otherwise>
        <li>
          <a href="{umbraco.library:NiceUrl(corDeptMenuItemLink)}">
          <xsl:value-of select="@nodeName"/>
          </a>
        </li>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:for-each>
</ul>
</xsl:template>