0031179: function isProductPresent does not exists in OB.Collection.OrderLineList.prototipe

diff --git a/web/org.openbravo.retail.posterminal/js/model/order.js b/web/org.openbravo.retail.posterminal/js/model/order.js
--- a/web/org.openbravo.retail.posterminal/js/model/order.js
+++ b/web/org.openbravo.retail.posterminal/js/model/order.js
@@ -2761,6 +2761,24 @@
   OB.Data.Registry.registerModel(OrderLine);
   OB.Data.Registry.registerModel(PaymentLine);
 
+  OB.Collection.OrderLineList=OB.Collection.OrderLineList.extend({isProductPresent: function(product) {
+    var result = null ;
+    if (this.length > 0) {
+        result = _.find(this.models, function(line) {
+            if (line.get('product').get('id') === product.get('id')) {
+                return true;
+            }
+        }
+        , this);
+        if (_.isUndefined(result) || _.isNull(result)) {
+            return false;
+        } else {
+            return true;
+        }
+    } else {
+        return false;
+    }
+}});
   // order model is not registered using standard Registry method becasue list is
   // becasue collection is specific
   window.OB.Model.Order = Order;