make selection_name required so that all listboxes will have a selection_name defined

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26170 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ListBox.py

@@ -225,7 +225,7 @@ class ListBoxWidget(Widget.Widget):
                                  description=('The name of the selection to store'
                                               'params of selection'),
                                  default='',
-                                 required=0)
+                                 required=1)
     property_names.append('selection_name')
 
     meta_types = fields.ListTextAreaField('meta_types',