`result` might be a Markup object (eg during tests) or a bytes-like object.
Step to reproduce: click on "Send by Mail" on a SO -> Traceback
Step to reproduce (2):
- Install website_sale
- Add something to the cart
- Go through checkout and click on Pay Now
- Crash, 500 error page, as this step is trying to generate the SO PDF to send
by mail to the customer, which tries to encode a bytes-like object.
```
AttributeError: 'bytes' object has no attribute 'encode'
```
But if you do that flow during a test, eg
```
./odoo-bin -d mydb --test-tags=.test_02_admin_checkout
```
You have a Markup object, thus you had to encode it.
Now, even during test, we return a bytes-like object.
Related to #68299
Community: https://github.com/odoo/odoo/pull/75377
Enterprise: https://github.com/odoo/enterprise/pull/20449
Part-of: odoo/odoo#75377
Romain Derie
88b19cfa92