being caught up needs some heads

A sync message from a ready peer only completes the initial sync if that
peer has at least one head.  A peer with an empty document can no longer
make a joiner ready on an empty store: a misconfigured second swarm, or
a genesis node in its first seconds.

Effect on a brand-new swarm: a joiner now waits until the genesis node
has registered itself in the member list, which happens within about 5 s
of it becoming ready.

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