corrected bug when there is only one element

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@534 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/skins/erp5_core/base_update_relation.py

@@ -120,7 +120,8 @@ try:
                                     selection_index = selection_index,
                                     selection_name = selection_name,
                                     uids = uids,
-                                    object_uid = object_uid)
+                                    object_uid = object_uid,
+                                    listbox_uid=None)
       kw = {}
       kw['form_id'] = 'search_relation'
       kw['selection_index'] = selection_index

product/ERP5/skins/erp5_core/update_relation.py

@@ -13,8 +13,9 @@ o = context.portal_catalog.getObject(object_uid)
 if o is None:
   return "Sorrry, Error, the calling object was not catalogued. Do not know how to do ?"
 
-selected_uids = context.portal_selections.updateSelectionCheckedUidList(selection_name,listbox_uid,uids)
-uids = context.portal_selections.getSelectionCheckedUidsFor(selection_name)
+if listbox_uid is not None:
+  selected_uids = context.portal_selections.updateSelectionCheckedUidList(selection_name,listbox_uid,uids)
+  uids = context.portal_selections.getSelectionCheckedUidsFor(selection_name)
 
 if request.has_key('previous_form_id'):
   previous_form_id = request.get('previous_form_id')