Well Silvia - this has generated some interesting discussion.
I �ve googled and haven �t found any recipes where chocolate and hazelnuts are in the food processor at the same time but did come across these different versions of instructions that you could consider:
Place chocolate in bowl of food processor and pulse to chop finely.
In a food processor, process the hazelnut kernels
Roughly chop 150g of milk chocolate and place into a medium sized bowl
Pulse hazelnuts with sugar in a food processor
In a food processor, fitted with the metal blade, place the coarsely chopped chocolate and brown sugar and process until the chocolate is very fine.
Using a food processor, grind the hazelnuts until fine and powdery.
Place the toasted hazelnuts into the food processor and process until very fine.
It seems that there are may ways you can suitably express this.
Hope it helps
Cheers
Jayho