[FIX] point_of_sale: index error when send receipt to customer in offline

An IndexError "list index out of range"  trace back that occurs in point_of_sale
/RecieptScreen :async _sendReceiptToCustomer was caught by sentry.
 order_server_id is undefined because it is  not properly sync with the server

step to reproduce:

1. First of all start the session in point_of_sale to produce error we have to
   be in offline mode and generate product order.
2. Add customer, select a payment method and validate.
3. After validation send email to customer(failed to send mail.
   because we are in offline mode and order_server_id is undefined )
4. Now get back to online mode and again send mail to customer
5. This time an IndexError 'list index out of range' is trace-backed.

So if order_server_id is null then we throw error to user.

sentry-3824163568

closes odoo/odoo#113017

X-original-commit: f7aa70bc0909bea04d6a5c251f966e03ffd44288
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>

addons/point_of_sale/i18n/point_of_sale.pot

@@ -6552,6 +6552,13 @@ msgstr ""
 
 #. module: point_of_sale
 #. odoo-python
+#. openerp-web
+#: code:addons/point_of_sale/static/src/js/Screens/ReceiptScreen/ReceiptScreen.js:0
+#, python-format
+msgid "This order is not yet synced to server. Make sure it is synced then try again."
+msgstr ""
+
+#. module: point_of_sale
 #: code:addons/point_of_sale/models/pos_session.py:0
 #, python-format
 msgid ""
@@ -6687,6 +6694,9 @@ msgstr ""
 #: code:addons/point_of_sale/static/src/xml/Popups/CashMoveReceipt.xml:0
 #, python-format
 msgid "VAT:"
+#: code:addons/point_of_sale/static/src/js/Screens/ReceiptScreen/ReceiptScreen.js:0
+#, python-format
+msgid "Unsynced order"
 msgstr ""
 
 #. module: point_of_sale

addons/point_of_sale/static/src/js/Screens/ReceiptScreen/ReceiptScreen.js

@@ -4,10 +4,9 @@ import { Printer } from "@point_of_sale/js/printers";
 import { is_email } from "web.utils";
 import { useErrorHandlers } from "@point_of_sale/js/custom_hooks";
 import { AbstractReceiptScreen } from "@point_of_sale/js/Misc/AbstractReceiptScreen";
+import { OfflineErrorPopup } from "@point_of_sale/js/Popups/OfflineErrorPopup";
 import { registry } from "@web/core/registry";
-
 import { OrderReceipt } from "./OrderReceipt";
-
 import { onMounted, useRef, status } from "@odoo/owl";
 import { usePos } from "@point_of_sale/app/pos_hook";
 
@@ -137,6 +136,15 @@ export class ReceiptScreen extends AbstractReceiptScreen {
             name: partner ? partner.name : this.orderUiState.inputEmail,
         };
         const order_server_id = this.env.pos.validated_orders_name_server_id_map[orderName];
+        if (!order_server_id) {
+            this.popup.add(OfflineErrorPopup, {
+                title: this.env._t("Unsynced order"),
+                body: this.env._t(
+                    "This order is not yet synced to server. Make sure it is synced then try again."
+                ),
+            });
+            return Promise.reject();
+        }
         await this.rpc({
             model: "pos.order",
             method: "action_receipt_to_customer",