add __traceback_info__ to have extra information in zope traceback. Usefull for debugging

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21559 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Accessor/Base.py

@@ -110,6 +110,7 @@ class Setter(Method):
 from Products.CMFCore.Expression import Expression
 def _evaluateTales(instance=None, value=None):
   from Products.ERP5Type.Utils import createExpressionContext
+  __traceback_info__ = (instance, value)
   expression = Expression(value)
   econtext = createExpressionContext(instance)
   return expression(econtext)