An RPC call using an empty array of fields has not the same behavior on the MockServer and the actual server: - the MockServer returns only the 'id' field - the actual server returns all the fields for the model This is due to the fact that an empty array evaluates to a falsy value in Python and evaluates to a thruthy value in JavaScript. This commit restores the parity between the two. closes odoo/odoo#36278 Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>