When using the odoo app,
`request.httprequest.user_agent.browser` is `False`,
instead of a string expected.
Therefore, `capitalize` cannot be called
```
2022-03-02 09:44:01,267 1321846 ERROR dle-test1 odoo.addons.saas_trial.models.res_users: 2fa by email failed
Traceback (most recent call last):
File "/home/odoo/src/custom/trial/saas_trial/models/res_users.py", line 267, in _send_totp_mail_code
return super()._send_totp_mail_code()
File "/home/odoo/src/odoo/saas-15.1/addons/auth_totp_mail_enforce/models/res_users.py", line 95, in _send_totp_mail_code
'browser': request.httprequest.user_agent.browser.capitalize(),
AttributeError: 'NoneType' object has no attribute 'capitalize'
```
closesodoo/odoo#85684
X-original-commit: 5a87db453fcfd750934d1a1d62c00d93ad01c0e1
Signed-off-by: Denis Ledoux (dle) <dle@odoo.com>