[FIX] account: account with single character code

The creation of an account with a single character code crashes.

opw-2176764

closes odoo/odoo#43455

X-original-commit: 7b1e881e60d6424f7b3a676c06a4b5b8a222d025
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/account/models/account.py

@@ -448,7 +448,7 @@ class AccountAccount(models.Model):
         # This field should have been a char, but the aim is to use it in a side panel view with hierarchy, and it's only supported by many2one fields so far.
         # So instead, we make it a many2one to a psql view with what we need as records.
         for record in self:
-            record.root_id = record.code and (ord(record.code[0]) * 1000 + ord(record.code[1])) or False
+            record.root_id = (ord(record.code[0]) * 1000 + ord(record.code[1:2] or ' ')) if record.code else False
 
     @api.depends('code')
     def _compute_account_group(self):