There is absolutely no risk whatsoever taking a train from CDG to Gare du Nord, with or without any intermediate stops.
The thing that it would be more dangerous taking a train with stops is absolutely rubbish!!
I've done that journey many many times and never ever had any problems or any inconvenience because of it.
I've never heard anybody else having any problems either, and I live in the city!

Take whatever train that comes first, if it's a direct one then good, you'll save perhaps a few minutes and there'll be slightly more space onboard for luggage.
But it's really not a big deal so don't bother too much about it!!

As I mentioned in my previous reply, most people here wouldn't even know there are two types of trains (nonstop/with stops) if some Parisian/French FTers had not mentioned it.
I can't imagine it's mentioned in any guidebooks for example.