[Dev] Empty response element in WSO2 ESB payload factory

[Charmi Jayanga]

Hi,

How to filter an empty response element in WSO2 ESB payload factory.

*Proxy Service*

<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse";
       name="count_iterate"
       transports="http,https"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <inSequence>
         <property name="it_count" value="0" scope="operation"/>
         <iterate expression="//symbols/symbol" sequential="true">
            <target>
               <sequence>
                  <property name="synapse_it_count"
                            expression="get-property('operation', 'it_count')"/>
                  <script language="js">var cnt_str =
mc.getProperty('synapse_it_count');
     var cnt = parseInt(cnt_str);
     cnt++;
     mc.setProperty('synapse_it_count', cnt.toString());</script>
                  <property name="it_count"
                            expression="get-property('synapse_it_count')"
                            scope="operation"/>
                  <aggregate>
                     <completeCondition>
                        <messageCount min="-1" max="-1"/>
                     </completeCondition>
                     <onComplete expression="//symbol">
                        <log level="custom">
                           <property name="number of symbols"

expression="get-property('operation','it_count')"/>
                        </log>
                        <payloadFactory media-type="xml">
                           <format>
                              <m xmlns="">
                                 <n>$1</n>
                              </m>
                           </format>
                           <args>
                              <arg evaluator="xml" expression="//symbol"/>
                           </args>
                        </payloadFactory>
                        <respond/>
                     </onComplete>
                  </aggregate>
               </sequence>
            </target>
         </iterate>
      </inSequence>
   </target>
   <description/>
</proxy>


*Scenario 1*

*Sample Request*

<symbols>
   <symbol>WSO2</symbol>
</symbols>


*Sample Response*

<m>
   <n>WSO2</n>
</m>


*Scenario 2*

*Sample Request*

<symbols>
   <symbol></symbol>
</symbols>


*Sample Response given from ESB*

<m>
   <n>
      <symbol/>
   </n>
</m>



Is there any way to avoid scenario 2? Or is there any workaround? I
just need the following response .

*Sample Response expected*

<m>
   <n></n>
</m>


Regards
Charmi

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