ZODB Components: Fix testERP5NamingConvention failure (mistake when preparing 448eea34).

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/BusinessTemplate_viewMigrateSourceCodeFromFilesystemDialog/listbox.xml

@@ -403,8 +403,6 @@
                           <string>reference</string>
                           <string>Name</string>
                         </tuple>
-                        <tuple>
-                        </tuple>
                         <tuple>
                           <string>portal_type</string>
                           <string>Destination Portal Type</string>