[FIX] point_of_sale: missing costumer facing display's check

Some calls to send_current_order_to_customer_facing_display() method
miss the check to the POS config's iface_customer_facing_display
property, resulting into an error during the rendering of the template.

This bug was introduce by odoo/odoo@5d0afddaf2

closes odoo/odoo#36916

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

addons/point_of_sale/static/src/js/models.js

@@ -665,7 +665,9 @@ exports.PosModel = Backbone.Model.extend({
         var order = new exports.Order({},{pos:this});
         this.get('orders').add(order);
         this.set('selectedOrder', order);
-        this.send_current_order_to_customer_facing_display();
+        if (this.config.iface_customer_facing_display) {
+            this.send_current_order_to_customer_facing_display();
+        }
         return order;
     },
     /**
@@ -2660,8 +2662,9 @@ exports.Order = Backbone.Model.extend({
         if(line.has_product_lot){
             this.display_lot_popup();
         }
-
-        this.pos.send_current_order_to_customer_facing_display();
+        if (this.pos.config.iface_customer_facing_display) {
+            this.pos.send_current_order_to_customer_facing_display();
+        }
     },
     get_selected_orderline: function(){
         return this.selected_orderline;

addons/point_of_sale/static/src/js/screens.js

@@ -551,7 +551,9 @@ var OrderWidget = PosBaseWidget.extend({
                 selected_orderline.price_manually_set = true;
                 selected_orderline.set_unit_price(val);
             }
-            this.pos.send_current_order_to_customer_facing_display();
+            if (this.pos.config.iface_customer_facing_display) {
+                this.pos.send_current_order_to_customer_facing_display();
+            }
     	}
     },
     change_selected_order: function() {