remove stop date constraint, stop date is acquired from start date, so checking

that start date is set is enough. And PropertyExistence does not check
acquisition, so it's a problem if stop date is not defined but just acquired.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22340 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/TaskConstraint.py

@@ -65,13 +65,6 @@ class TaskConstraint:
       'message_property_not_set': 'Begin Date must be defined',
       'message_no_such_property' : 'Begin Date must be defined' 
     },
-    { 'id'            : 'stop_date_existence',
-      'description'   : 'Property stop date must be defined',
-      'type'          : 'PropertyExistence',
-      'stop_date'     : None,
-      'message_property_not_set': 'End Date must be defined',
-      'message_no_such_property' : 'End Date must be defined'
-    },
     { 'id'            : 'date_coherency',
       'description'   : 'Stop Date must be after Start Date',
       'type'          : 'TALESConstraint',