While querying the Debian BTS SOAP interface at http://bugs.debian.org/cgi-bin/soap.cgi ZSI raised an exception:
ZSI.EvaluateException: Non-nillable element is NIL
[Element trace: /soap:Envelope/soap:Body/get_statusResponse/s-gensym3/item/value/found/item/value]
I've attached my sample code and the HTTP response showing the element causing this exception.
After googeling for it I came across a japanese blog outlining a solution:
The attached patch applies the fix to TC.py.