sshd on FreeBSD default allows blank passwords?

[T.]

I didn't realize this before, but it came to my attention when debugging 
PAM problems.
Actually, sshd default does not allow it, but another default is in 
enabling PAM.
It's passing power over to PAM which is allowing it.

I didn't see another way immediately available to fix it, so I disabled 
PAM in sshd. Works as expected now.

Is there a PAM solution for this?

Is this intended to be the default behavior?