acquisition portal type is a tales expression

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2816 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFCategory/PropertySheet/BaseCategory.py

@@ -26,6 +26,8 @@
 #
 ##############################################################################
 
+from Products.CMFCore.Expression import Expression
+
 class BaseCategory:
     """
         Properties for BaseCategory Objects
@@ -45,7 +47,7 @@ class BaseCategory:
         {   'id'          : 'acquisition_portal_type',
             'description' : 'The portal types to browse',
             'type'        : 'tales',
-            'default'     : [],
+            'default'     : Expression('python: []'),
             'multivalued' : 1,
             'mode'        : 'w' },
         {   'id'          : 'fallback_base_category',