So,
I guess we can call it the "3po Precedent" (you have to at least guess "1" - no longer 0), but read on page 11 of the Rules Reference under "Focus:"
"A ship cannot spend a focus token to change (focus) results to (evade) or (hit)
results if it does not have any (focus) results."
So this means Garvin in 2.0 has to have rolled focus results to pass on the focus. No more spending a focus for "zero focus results."
It also makes me bet Ten Numb will get FAQed to say that he must have rolled focus results to spend his stress.