Previously, the colspan of empty lines in list view did not account for the fact that the column with the delete action is not always present, resulting in incorrect colspan on empty lines when it is not. This commit fixes that by accounting for it, and also fixes the size of the header of that column, which is supposed to be fixed at 32px but wasn't in some circumstances. closes odoo/odoo#98711 Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>