this conditional was reverse

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25304 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Delivery.py

@@ -133,7 +133,7 @@ class Delivery(XMLObject, ImmobilisationDelivery):
         aggregate = self.Delivery_zGetTotal(**kw)[0]
         result = aggregate.total_price or 0
       method = self._getTypeBasedMethod('getTotalPrice')
-      if method is None:
+      if method is not None:
         return method(result)
       return result