I've always heard of that particular action referred to as "Light Double Action". It's a hybrid that is supposed to combine the speed and aiming advantage of a single action with the safety of a double action. Even if the hammer fell from the half cocked position (which it wouldn't), it couldn't fire the round.

Glock also puts the safety switch right on the trigger. Your fingertip disengages it when you pull the trigger. The safer design does not require a seperate safty switch to lock the trigger from an accidental pull.

An itchy trigger finger is still dangerous though. So watch it Paddy! You've got a nervous twitch in your eye.