[Dovecot] LDA null logging patch

[Timo Sirainen]

On Sat, 2011-04-16 at 03:04 -0700, Joseph Tam wrote:
> I don't really need logging of successful local deliveries since the MTA
> provides enough data.  I can't get rid of LDA delivery logs by setting
> 
>  	deliver_log_format =
> 
> All this does is produce an empty log message e.g.
> 
>  	Apr 16 01:22:05 dserver dovecot: lda(user):
> 
> Timo, would you consider inclusion of this patch which will skip
> logging deliveries if deliver_log_format is empty:

Committed, slightly modified:
http://hg.dovecot.org/dovecot-2.0/rev/0e406e7cb609