[FIX] point_of_sale: show the loading PoS data error

Before this commit, if there was an error, the PoS stays on
the loading page which was confusing for the user.

owp-3834647

closes odoo#161624

X-original-commit: da88f6b
Signed-off-by: Adrien Guilliams (adgu) <adgu@odoo.com>
Signed-off-by: Pedram Bi Ria (pebr) <pebr@odoo.com>

addons/point_of_sale/static/src/app/store/pos_store.js

@@ -12,7 +12,7 @@ import { deduceUrl, getOnNotified } from "@point_of_sale/utils";
 import { Reactive } from "@web/core/utils/reactive";
 import { HWPrinter } from "@point_of_sale/app/printer/hw_printer";
 import { memoize } from "@web/core/utils/functions";
-import { ConnectionLostError } from "@web/core/network/rpc";
+import { ConnectionLostError, RPCError } from "@web/core/network/rpc";
 import { OrderReceipt } from "@point_of_sale/app/screens/receipt_screen/receipt/order_receipt";
 import { _t } from "@web/core/l10n/translation";
 import { CashOpeningPopup } from "@point_of_sale/app/store/cash_opening_popup/cash_opening_popup";
@@ -114,6 +114,16 @@ export class PosStore extends Reactive {
             pos_data,
         }
     ) {
+        if (pos_data instanceof Error) {
+            let message = _t("An error occurred while loading the Point of Sale: \n");
+            if (pos_data instanceof RPCError) {
+                message += pos_data.data.message;
+            } else {
+                message += pos_data.message;
+            }
+            window.alert(message);
+            window.location = "/web#action=point_of_sale.action_client_pos_menu";
+        }
         this.env = env;
         this.numberBuffer = number_buffer;
         this.barcodeReader = barcode_reader;