This might put your mind a bit more at ease. On Fitday, it's listed under Gelatine desserts and here is a link to the stats for 1 cup of sugar-free gelatine:
http://www.fitday.com/WebFit/FoodFa...010&OwnerID=100
It's very low in carbs. Just be aware that most sugar-free gelatine is sweetened with Aspartame (at least in the US) which can stall some people.
HTH!