Fix Pentaho Kettle data laoding, where new records have 'id'=0

Pentaho Kettle ships with "output steps" to lodd data into OpenERP/Odoo.
A `.id` data column is always sent, but sisnce XMLRPC does not support `None` values, for the new records a zero is sent.

This doesn't work with v8 since the server looks up for the zero `id` record, doesn't find it, and returns an error, making the OpenERP Output unusable.
v7 initially featured the same problem and it was fixed.