sudo TTY Unknown messages

[Robin Becker]

I am getting messages from sudo concerning an unknown TTY.

eg

Dec 29 02:30:40 www sudo:     root : TTY=unknown ; PWD=/usr/tmp/BU/svn_backups ; 
USER=www ; COMMAND=/usr/local/bin/svnadmin dump -q -r0:19591 /svn/private

I think this is caused by not having a tty device in the root cron job. I would 
prefer to keep only one main cron job for my system or is that frowned upon.
-- 
Robin Becker