Bug#774380: spamassassin: sa-update cronjob complains when spamd is disabled

[Samuel Wolf]

Same problem here:
/etc/cron.daily/spamassassin:
Job for spamassassin.service failed. See 'systemctl status
spamassassin.service' and 'journalctl -xn' for details.
invoke-rc.d: initscript spamassassin, action "reload" failed.

Jessie with systemd.