[18.0] partner_firstname: causes mail tests to fail

[vincent-hatakeyama]

Module

partner_firstname

Describe the bug

When running the tests with partner_firstname installed, mail tests fails.
The failing tests are subtests of TestPartner.test_name_create_corner_cases where the name is '', ' ', False or None.

To Reproduce

Affected versions: 18.0

Steps to reproduce the behavior:

1. Install partner_firstname on a base
2. Run mail tests (limiting tests to TestPartner.test_name_create_corner_cases is enough to reproduce)

Expected behavior

The tests should not fail.

Additional context

Tests failing causes issues with deploying on odoo.sh.