getTotalPrice and getTotalQuantity return 0 by default.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2799 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Delivery.py

@@ -562,7 +562,7 @@ class Delivery(XMLObject):
       if src__:
         return self.Delivery_zGetTotal(src__=1, **kw)
       aggregate = self.Delivery_zGetTotal(**kw)[0]
-      return aggregate.total_price
+      return aggregate.total_price or 0
 
     security.declareProtected(Permissions.AccessContentsInformation, 'getTotalQuantity')
     def getTotalQuantity(self, src__=0, **kw):
@@ -574,7 +574,7 @@ class Delivery(XMLObject):
       if src__:
         return self.Delivery_zGetTotal(src__=1, **kw)
       aggregate = self.Delivery_zGetTotal(**kw)[0]
-      return aggregate.total_quantity
+      return aggregate.total_quantity or 0
 
     security.declareProtected(Permissions.AccessContentsInformation, 'getDeliveryUid')
     def getDeliveryUid(self):