[FIX] website_sale: redirection to shop if no transaction doesn't work

In V14 this case is managed : https://github.com/odoo/odoo/blob/14.0/addons/website_sale/controllers/main.py#L1075



closes odoo/odoo#119403

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>
Co-authored-by: vfe-odoo <Feyensv@users.noreply.github.com>