access challenge on empty password

[izotov]

Hi,
I use pam_radius with openssh on a FreeBSD box. When I authenticate, and for
the first time I simply enter an empty password then the second time I am
prompted for the password characters are echoed on the terminal.
As I can see my freeradius server responses an access challenge to request
with an existing user and empty password combo.
Is this a normal behaviour? How can I configure the system not to do so?
Thanks!

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