Return err instead of 0 for unavailable participation #5934
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What type of PR is this?
What does this PR do? Why is it needed?
If the participation info of an epoch is not yet available (ie due to skip blocks, node processes epoch based on new block, not based on time), the node should return an
unavailable
error, instead of return new struct with all fields initialized to 0s. This has been confusing to many users, they often asked, why my node reported 0 stake was participated.