[FIX] pos_restaurant: product with no category

When computing the category count for the ActionpadWidget, it is
possible that a product does not have one. If it doesn't, we do not take
it into account in the category count. This implementation also fixes
the crash when opening an order with a order change with a product
without category.

closes odoo/odoo#129960

X-original-commit: 86c69c2f4f91bfc91871ca0c4f6ea5acff3c975c
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>

addons/pos_restaurant/static/src/overrides/components/product_screen/actionpad_widget/actionpad_widget.js

@@ -56,6 +56,9 @@ patch(ActionpadWidget.prototype, "point_of_sale.ActionpadWidget", {
         for (const idx in orderChange) {
             const orderline = orderChange[idx];
             const categoryId = this.pos.db.get_product_by_id(orderline.product_id).pos_categ_ids[0];
+            if (!categoryId) {
+                continue;
+            }
             const category = this.pos.db.category_by_id[categoryId].name;
             const numProd = orderline.quantity;
             categories[category] = categories[category] ? categories[category] + numProd : numProd;