Fixed submitSoapRequest for requests without parameters

Plugins/org.commontk.dah.core/ctkSimpleSoapClient.cpp

@@ -72,8 +72,11 @@ const QtSoapType & ctkSimpleSoapClient::submitSoapRequest(const QString& methodN
                                                    QtSoapType* soapType )
 {
   QList<QtSoapType*> list;
-  list.append(soapType);
-  return submitSoapRequest(methodName,list);
+  if(soapType != NULL)
+    {
+    list.append(soapType);
+    }
+    return submitSoapRequest(methodName,list);
 }
 
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