mesh/check checking e7888024a826 on 769815ac0fea | novox/mesh-delivery#103 in group fix/lost-check
Re-review of fix/lost-check: writing an empty list at the end kept one key
for every verdict key ever checked. Tests: every row of the lost-ask table
proves the key gone at the end; one row more (deaf after its build module
replaced it, asked again by hand); counts unchanged.