When accessing the job positions page, country is detected automatically
to filter only those jobs whose country match current one + the ones
available in any country. However, when job positions have no specific
country, they're being excluded due to the usage of an old API
(expecting relational fields as `None` when they're empty), so only
positions with country are being taken into account.
This commit fixes the above by expecting the correct value (an empty
recordset) when an address is not set.
closesodoo/odoo#95454
X-original-commit: 65a285124bc0833c511905719da1712b0c747e24
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>