I can confirm this bug on hardy. htdig uses lockfile-create, lockfile-touch and lockfile-remove in /etc/cron.daily/htdig, yet it does not depend on lockfile-progs.
I can confirm this bug on hardy. htdig uses lockfile-create, lockfile-touch and lockfile-remove in /etc/cron. daily/htdig, yet it does not depend on lockfile-progs.