[Dovecot] 1.2.15 - segfault if host field attribute not present in ldap. (proxy)

[Mohit Chawla]

In case this is relevant:

kernel: [17549.714369] imap-login[11704]: segfault at 0 ip b75c3d23 sp
bf888178 error 4 in libc-2.11.2.so[b7551000+140000]

If no host field attribute is present in ldap (like mailHost for
qmail-ldap), and we are trying to use proxy,  then dovecot segfaults. If
more information's needed, let me know.

Also, somewhat unrelated, but maybe the wiki needs to be edited since using
a template as =proxy_maybe=y works, while in wiki its kinda opposite. I
don't know of specifics, but should I try using a recent release ?