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https://github.com/harmony-one/harmony/pull/4663/files#diff-9cfef24a4e8a4cf4ef84b772edcde2d1c3993f8373a9b9a376377c1385802f29R156
if crosslink are not sent for an entire epoch signed and toSign will be 0 and 0.
when that happen, next epoch there will no shard 1 validator elected in the committee.