auth: Don't crash if passwd-file is used for authentication but it has no passwords.
auth: Don't crash if passwd-file is used for authentication but it has no passwords.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot