avoid rejecting empty era file in verification #6163
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`batchVerify`'s precondition is a non-empty signature list:
```nim
if input.len == 0:
# Spec precondition
return false
```
This means that in eras without any blocks (as has happened on Goerli),
calling it leads to era files being reported as invalid.
tersec
approved these changes
Apr 3, 2024
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batchVerify's precondition is a non-empty signature list:This means that in eras without any blocks (as has happened on Goerli), calling it leads to era files being reported as invalid.