2! Yes, you can use Stayman with no points as long as you are willing to pass any response. That's the case here, so you will pass partner's response. On a really bad day, partner has 5 clubs and you play in a 4-2 fit.

Note: this use of Stayman is one of the big reasons it is important that opener can only respond to Stayman with 2, 2, or 2.