Не выводить названия "пустых" разделов дополнительных свойств

<property_value id="790">
         <property_id>97</property_id>
         <entity_id>171</entity_id>
         <value></value>
         <property_dir_id>3</property_dir_id>
         <tag_name>sdh</tag_name>
      </property_value>

<xsl:template match="property_dir">
   <xsl:variable name="properties_for_property_dir" select="property/@id"/>
   <xsl:if test="count(/shop/shop_item/property_value[property_id = $properties_for_property_dir and value != '' and value != 0]) &gt; 0">
      <xsl:value-of select="name"/>
   </xsl:if>
</xsl:template>