fix regression introduced in r25911: the line for domain_tree was shown even...

fix regression introduced in r25911: the line for domain_tree was shown even if domain tree is not activated

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26021 20353a03-c40f-0410-a6d1-a30d3c3de9de