Fix wrong recordset returned when no binding found
Fix wrong recordset returned when no binding found

When we call the binder 'to_openerp' method with 'unwrap', we expect the
binder to return the 'unwrapped' record of the binding, e.g.
product.product instead of prestashop.product.product.

When no record is found, the binder *must* return an empty recordset of
the correct (unwrapped) model too.

OCA/connector,OCA/connector