Module Products.ERP5Type.Document.Order, line 76, in getTotalPrice
  Module Products.ERP5.Document.Delivery, line 124, in getTotalPrice
  TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'
when this delivery contain a cell where price is not defined.
This test case reproduces this bug



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21184 20353a03-c40f-0410-a6d1-a30d3c3de9de