Dbip white/black lists... issue with black list

Hello all,

According to the doc (GitHub - linuxserver/docker-mods at swag-dbip), white/black lists is to be configured in each subdomain.conf by including :
if ($lan-ip = yes) { set $geo-whitelist yes; }
if ($geo-whitelist = no) { return 404; }

This code includes only code related to whitelist filtering. Is blacklist test not required?
in my testing using this code only whitelisted countries are allowed.

Maybe I missed something?