0037635: Null Pointer exception thrown when picking sales order

# HG changeset patch
# User Nono Carballo <nonofce@gmail.com>
# Date 1515952029 18000
#      Sun Jan 14 12:47:09 2018 -0500
# Node ID 37d892adc0aacaaab9adae9707975d5a352e454d
# Parent  f763e588e47a0fa6d58fa875071cda03aa517823
Fixes issue 37635: Null Pointer exception thrown when picking sales order

To prevent NPE for Sales Orders created before installation of AWO modules,
Quantity Pending Picking is calculated, if null, as
Ordered Quantity - Delivered Quantity

diff --git a/src/org/openbravo/warehouse/advancedwarehouseoperations/eventobserver/TaskEventObserver.java b/src/org/openbravo/warehouse/advancedwarehouseoperations/eventobserver/TaskEventObserver.java
--- a/src/org/openbravo/warehouse/advancedwarehouseoperations/eventobserver/TaskEventObserver.java
+++ b/src/org/openbravo/warehouse/advancedwarehouseoperations/eventobserver/TaskEventObserver.java
@@ -1,6 +1,6 @@
 /*
  ************************************************************************************
- * Copyright (C) 2016-2017 Openbravo S.L.U.
+ * Copyright (C) 2016-2018 Openbravo S.L.U.
  * Licensed under the Openbravo Commercial License version 1.0
  * You may obtain a copy of the License at http://www.openbravo.com/legal/obcl.html
  * or in the legal folder of this module distribution.
@@ -342,7 +342,14 @@
    */
   private void setPendingQtyPicking(final OBAWOTask task, final EntityPersistenceEvent event,
       final OrderLine salesOrderLine) {
-    final BigDecimal qtyPendingPicking = salesOrderLine.getObawoPendingQtyPicking();
+    BigDecimal qtyPendingPicking = salesOrderLine.getObawoPendingQtyPicking();
+    
+//    For Sales Order Lines created before installation of AWO module, the Quantity Pending Picking
+//    is null, in that case, the value is calculated as Ordered Quantity - Delivered Quantity.
+    if (qtyPendingPicking == null) {
+      qtyPendingPicking = salesOrderLine.getOrderedQuantity().subtract(
+          salesOrderLine.getDeliveredQuantity());
+    }
     final Order salesOrder = salesOrderLine.getSalesOrder();
     final Long pendingPickingLines = salesOrder.getOBAWOPendingPickingLines();