Since [1] and [2], the mobile app gets this error when trying to login
on v15, while it was working fine in v14 with TOTP enabled.
The 'authenticate' JSON-RPC route tries to authenticate the user and
then call `session_info()`. As no UID is defined, some methods in
`session_info()` raise an exception and an unexpected error is sent:
* `_is_public()` -> "Expected singleton: res.users()"
* `get_web_translations_hash()` -> "lang"
In this fix, this exception is avoided and the proper result is sent,
allowing the authentication process to continue.
Steps to reproduce:
* Try to connect to an account with TOTP on the mobile app (v15+) => BUG
Refs:
[1] odoo/odoo@80d74e7ee0
[2] odoo/odoo@401fc7efe9
X-original-commit: 65dca67ecdcc2228d90781a9f5ccd99f290ada6c
Part-of: odoo/odoo#79182
Romeo Fragomeli
0cecf918a6