guard: circuit_send_next_onion_skin(): Bug: 3-hop circuit <ptr> with purpose 18 has no guard state

Got 7 of those in rapid succession just after self test was done.

 16:43:58 [WARN] circuit_send_next_onion_skin(): Bug: 3-hop circuit <ptr> with purpose 18 has no guard state (on Tor 0.3.0.0-alpha-dev 4ec9751c144465f6)

At commit 4ec9751c144465f6

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