[FIX] website_sale_loyalty: fix possible crash during tests

This commit attempts to fix an undeterministic error, calling an
ensure_one method on an empty recordset.

closes odoo/odoo#99808

X-original-commit: 8e079bc0509f13794c61efeb1080c59baad65590
Signed-off-by: William Braeckman (wbr) <wbr@odoo.com>

addons/website_sale_loyalty/controllers/main.py

@@ -30,8 +30,9 @@ class WebsiteSale(main.WebsiteSale):
     def shop_payment(self, **post):
         order = request.website.sale_get_order()
         res = super(WebsiteSale, self).shop_payment(**post)
-        order._update_programs_and_rewards()
-        order._auto_apply_rewards()
+        if order:
+            order._update_programs_and_rewards()
+            order._auto_apply_rewards()
         return res
 
     @http.route(['/shop/cart'], type='http', auth="public", website=True)