[FIX] pos_loyalty: reset if the order is empty

closes odoo/odoo#102147

X-original-commit: 1a12b819fd7cfef98c11325e25d687361c4f9be5
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>

addons/pos_loyalty/static/src/js/TicketScreen.js

@@ -11,6 +11,7 @@ export const PosLoyaltyTicketScreen = (TicketScreen) =>
     class PosLoyaltyTicketScreen extends TicketScreen {
         _onUpdateSelectedOrderline() {
             const order = this.getSelectedSyncedOrder();
+            if (!order) return NumberBuffer.reset();
             const selectedOrderlineId = this.getSelectedOrderlineId();
             const orderline = order.orderlines.find((line) => line.id == selectedOrderlineId);
             if (orderline && this._isEWalletGiftCard(orderline)) {