no need to define default value explicitly.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32462 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/InvoicingRule.py

@@ -74,10 +74,6 @@ class InvoicingRule(Rule):
   def isDeliverable(self, movement):
     return movement.getResource() is not None
 
-  def _getExpandablePropertyUpdateDict(self, applied_rule, movement,
-      business_path, current_property_dict):
-    return {}
-
   security.declareProtected(Permissions.AccessContentsInformation,
                             'getExpandablePropertyList')
   def getExpandablePropertyList(self, default=None):