After this commit, adaptations for the more menu behaviour are not computed when there is no sections menu at all. Also, before this commit, the more menu dropdown was always attached in the dom, even if not visible. Now it is only attached when needed. closes odoo-dev/odoo#814 Related: odoo-dev/enterprise#102 Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>