Mikko's DSII stats

I've misplaced Mikko's address, so I'll ask here instead:

Mikko, why does your DSII percentage-roll vehicle damage table indicate
that there is no chance of "missing" (drawing no valid chits against) targets
with armour rating 0?

I have probably missed something important somewhere, but the rules seem to
indicate that only valid chits count... a weapon which only inflicts (eg.)
"Yellow" should have a fairly significant chance of not
damaging even a soft-skinned vehicle?

Later,