A couple of problems with triggers that have no events in the Monitoring - Triggers page

1. If we create a new trigger and open the Monitoring - Triggers section, the duration of the trigger state in the "Age" column is displayed as "43y 5m 23d". If a trigger has no "last change" date, the age should be displayed at all.
2. If a trigger has no events, the date in the "Last change" column should be displayed as plain text, not a link.