Hides the empty label the same way as the group-by field if it doesn't need to be shown (no default_location_dest_id/default_location_src_id). Part of task-2985735 closes odoo/odoo#102759 X-original-commit: 6030147e12b628e8759700058b8ac3c3889007a8 Signed-off-by: Bouvy Damien (dbo) <dbo@odoo.com> Signed-off-by: Quentin Wolfs (quwo) <quwo@odoo.com>