Before, there was no support of nolabel in tree view but now we added it. So in this commit, Replace the empty string with nolabel True. closes odoo/odoo#64212 Taskid: 2414124 X-original-commit: 4286f2f90258a5c1f97d42f7c2aee1e964723ca0 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>