If UIDL command can't get the UID, die instead of not returning anything and still replying "OK".
If UIDL command can't get the UID, die instead of not returning anything and
still replying "OK".

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