NPE when process received error response from partner with empty <details>
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                 Key: ODE-255
                 URL: https://issues.apache.org/jira/browse/ODE-255
             Project: ODE
          Issue Type: Bug
          Components: BPEL Runtime
    Affects Versions: 1.2
         Environment: Windows XP Pro, JDK 1.5.0.07, Oracle 10g XE, Apache 
Tomcat 5.5.25, OpenJPA
            Reporter: Alexey Ousov
             Fix For: 1.2


When process recieved error response from external service with empty <detail> 
element, for example:
<?xml version='1.0' encoding='utf-8'?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:wsa="http://www.w3.org/2005/08/addressing";>
  <soapenv:Header>
    <wsa:Action>http://www.w3.org/2005/08/addressing/soap/fault</wsa:Action>
    <wsa:RelatesTo>uuid:hqejbhcnphr35ptj6ib53m</wsa:RelatesTo>
  </soapenv:Header>
  <soapenv:Body>
    <soapenv:Fault>
      <faultcode>soapenv:Server</faultcode>
      <faultstring>org.xml.sax.SAXParseException: Content is not allowed in 
prolog.</faultstring>
      <detail />
     </soapenv:Fault>
  </soapenv:Body>
</soapenv:Envelope>

the following exception occur:
java.lang.NullPointerException
        at 
org.apache.ode.axis2.util.SoapMessageConverter.inferFault(SoapMessageConverter.java:553)
        at 
org.apache.ode.axis2.util.SoapMessageConverter.parseSoapFault(SoapMessageConverter.java:529)
        at org.apache.ode.axis2.ExternalService.reply(ExternalService.java:278)
        at org.apache.ode.axis2.ExternalService.invoke(ExternalService.java:152)
        at 
org.apache.ode.axis2.MessageExchangeContextImpl.invokePartnerUnreliable(MessageExchangeContextImpl.java:67)
        at 
org.apache.ode.bpel.engine.PartnerLinkPartnerRoleImpl$UnreliableInvoker.run(PartnerLinkPartnerRoleImpl.java:339)
        at 
org.apache.ode.bpel.engine.BpelProcess$ProcessRunnable.run(BpelProcess.java:1123)
        at 
org.apache.ode.bpel.engine.BpelServerImpl$ServerRunnable.run(BpelServerImpl.java:793)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
        at java.util.concurrent.FutureTask.run(FutureTask.java:123)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)


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