fix: skip empty epochs in tally slasher #20361
Open
+57
−3
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For a slashing round where some of the epochs had no committee, a payload could fail if trying to slash the empty committees (yes it shound funky).
The issue was first found in early Jan, but since the failure case required quorum on something "useless" we did not fix it on the contract then. But as it is a straight forward fix we have now also done it on the contract.