Can't generate a <fieldName xsi:nil="true" /> field in request payload

[Clovel]

If an element is set to nillable="true, we should be able to set the element as null to get the following XML result

xsi:nil="true"

For now, the code generator indicates that the nillable="true field is either <fieldType> or undefined.

Setting the field to undefined makes the field disappear in the resulting request XML payload.

One could say that this should be managed by the server side, but that's implementation specific and not always possible when calling an external SOAP API.

Anyone have any insight on this ?