Clios (Mk2, dunno about Mk3) have two-stage bags... The smaller volume airbag should go off in collision at 12mph, and I think the larger one fires above 20ish... but either way you should get some sort of discharge if you hit something at 12mph or above, looks a bit worrying that it didn't occur in this crash but the impact to the front end directly could have perhaps been less than the trigger speed, with the damage being contributed to by the speed the car was travelling sideways at the time, if that makes sense! Looking back at the pics, it looks like the car had quite a lot of sideways motion (driver side first) at the time (notice how the car is twisted and the the localisation of the damage).
Did either side airbag go off at all?