[FIX] account_edi: allow attachment and error in same document

Allow having in an attachment as well as an error in the same document.
This will allow to see the document that generates the error, and easy
the process of debugging.

closes odoo/odoo#60163

Related: odoo/enterprise#14167
Signed-off-by: Jorge Pinna Puissant (jpp) <jpp@odoo.com>