before this commit, on clicking the publish/unpublish
buttons from the tree view of the forum post, is showing
traceback due to missing is_published field in the
forum.post model.
publish/unpublish buttons in the action menu is added
by the js class website_pages_list.
after this commit, the js class is removed from the
tree and thus no publish/unpublish button is shown
in the action menu.
closesodoo/odoo#128540
X-original-commit: ada177c9a840347330942a8e1db2204bf0c280e0
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>