[FIX] compatibility with pos_restaurant

pos_order_mgmt/readme/CONTRIBUTORS.rst

@@ -1,3 +1,4 @@
 * David Vidal <david.vidal@tecnativa.com>
 * Sylvain LE GAL (https://twitter.com/legalsylvain)
 * Carlos Martínez <carlos@domatix.com>
+* Pierrick Brun <pierrick.brun@akretion.com>

pos_order_mgmt/static/src/js/widgets.js

@@ -63,7 +63,10 @@ odoo.define('pos_order_mgmt.widgets', function (require) {
 
         show: function () {
             var self = this;
-            var previous_screen = this.pos.get_order().get_screen_data('previous-screen');
+            var previous_screen;
+            if (this.pos.get_order()) {
+                previous_screen = this.pos.get_order().get_screen_data('previous-screen');
+            }
             if (previous_screen === 'receipt') {
                 this.gui.screen_instances.receipt.click_next();
                 this.gui.show_screen('orderlist');
@@ -267,7 +270,7 @@ odoo.define('pos_order_mgmt.widgets', function (require) {
                 method: 'load_done_order_for_pos',
                 args: [order_id],
             }).then(function (order_data) {
-                self.gui.back();
+                self.gui.show_screen('orderlist');
                 var correct_order_print = true;
                 if (action === 'return') {
                     order_data.return = true;