You are right, while it might be close, I would not be surprised with a blow out loss due to:
1. Some oui in polls realling being nons as you suggest
2. Many undecideds being unadmitted nons
3. The rest of the undecideds just not bothering to vote as they are really undecided
We shall see.
We shall see indeed, in a few hours.
Schadenfreude would be very nice, but I am also hoping that a NON will shake things over there (though not really holding my breath).