Colorless tags on tracks are considered as used in backend only for internal organization. They should not be displayed in frontend notably * not in search dropdowns; * not in agenda; * not in cards / list views; If a tag category holds only colorless tags, do not display as a void search dropdown in frontend, hide it. Followup of 981f95bbf46658eda9f2d33751b9310cc67d86aa closes odoo/odoo#55445 X-original-commit: 5c09e2135cda2c76b179d264ff4e49a4909d5285 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>