permissive type list was not a list

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18302 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Constraint/PropertyTypeValidity.py

@@ -60,7 +60,7 @@ class PropertyTypeValidity(Constraint):
   }
   
   # Properties of type eg. "object" can hold anything
-  _permissive_type_list = ('object')
+  _permissive_type_list = ('object', )
 
   def checkConsistency(self, obj, fixit=0):
     """