Improve stability of getNodeCreationBlock for L3s #2682
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Previously, a spurious failure of
getNodeCreationBlockForLogLookupdue toNO_NODE(e.g. because it was routed to a node that's slightly behind others) would cause the node to permanently stop using the method, breaking it for L3s. Instead, this PR both recognizes that NO_NODE is an ephemeral error and permanently saves the fact that the method previously succeeded.