Passwordless accounts vi ports!

I just checked the security scanning outputs of FreeBSD and found this
surprising result:

[...]
Checking for passwordless accounts:
polkitd::565:565::0:0:Polkit Daemon User:/var/empty:/usr/sbin/nologin
pulse::563:563::0:0:PulseAudio System User:/nonexistent:/usr/sbin/nologin
saned::194:194::0:0:SANE Scanner Daemon:/nonexistent:/bin/sh
clamav::106:106::0:0:Clamav Antivirus:/nonexistent:/usr/sbin/nologin
bacula::910:910::0:0:Bacula Daemon:/var/db/bacula:/usr/sbin/nologin
[...]

Obviously, some ports install accounts but do not secure them as there is an
empty password.

I consider this not a feature, but a bug.

Regards,
Oliver