[Dovecot] nopassword not working in Dovecot 2.2rc3?

[Christian Felsing]

Hello,

I got some problems while set up a test system for Client Cert Auth,
therefore passwords are not requred.

SELECT NULL AS password, 'Y' as nopassword, userid AS user FROM users
WHERE userid = 'user at example.net'

shows exactly what is expected, bur Dovecot does net regongnize 'Y' as
nopassword:

Mar 25 11:18:04 dovecot dovecot: auth: Debug:
sql(user at example.net,192.168.200.6,<gndyHr3Y/gCwxigG>): query: SELECT
NULL AS password, 'Y' as nopassword, userid AS user FROM users WHERE
userid = 'user at example.net'
Mar 25 11:18:04 dovecot dovecot: auth:
sql(user at example.net,192.168.200.6,<gndyHr3Y/gCwxigG>): Empty password
returned without nopassword
Mar 25 11:18:06 dovecot dovecot: auth: Debug: client passdb out:
FAIL#0112#011user=user at example.net
Mar 25 11:18:07 dovecot dovecot: imap-login: Disconnected (auth failed,
2 attempts in 9 secs): user=<user at example.net>, method=PLAIN,
rip=192.168.200.6, lip=192.168.200.22, TLS

As shown on http://wiki2.dovecot.org/AuthDatabase/SQL select statement
above should prevent Dovecot from verifying password.

any hints?

best regards
Christian