Replaced method call to nonexistant method extends by call of extend.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13118 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ScribusUtils.py

@@ -112,7 +112,7 @@ class ManageModule:
       selection = selection.split (',')
       if portal_skins_folder_name not in selection:
         new_selection = [portal_skins_folder_name,]
-        new_selection.extends(selection)
+        new_selection.extend(selection)
         portal_skins.manage_skinLayers(skinpath = tuple(new_selection),
                                        skin_name = skin_name,
                                        add_skin = 1)