Web Service As Relational importer cannot handle web services that have an input but no output

If you try to use the Web Service As Relational Importer on the attached StockQuoteService.wsdl file (a sample from the Axis2 1.3 distribution), you'll find that while it passes validation, if on the WSDL Operations Selection screen you leave the selections at their defaults (both of the SOAP 1.1 web services selected, and the SOAP 1.2 web services unchecked), when you press Finish you'll get an NPE. But if you uncheck the "update" service (leaving only getPrice selected), then you can click Finish and create the source model.

The issue with the "update" operation is that it is an operation with an input but no output. If you modify the WSDL so that this service does indeed have an output (per the StockQuoteService-greg.wsdl attached), both services will import successfully.

We should be able to handle such operations (ones with no output).