Revert removal of 'default' property (r30059), because it breaks testOOoChart

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30353 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/OOoChart.py

@@ -55,8 +55,12 @@ class OOoChartWidget(Widget.Widget):
 
   property_names = list(Widget.Widget.property_names)
 
-  # Default has no meaning in OOoChart.
-  property_names.remove('default')
+  default = fields.StringField(
+                              'default',
+                              title='Default',
+                              description=("A default value (not used)."),
+                              default="",
+                              required=0)
 
   listbox_form_id = fields.StringField(
                               'listbox_form_id',