[DRAFT]fix: lastBlockList should be set at the end

[thomas-nguy]

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[JayT106]

LGTM

[calvinaco]

I believe the original place to update the h.lastBlockList is actually ok - more precisely: it's not the best place...but it's not posing any problems.

If we put it at the end only after block list is successfully updated:

1. if the new block list is empty, h.lastBlockList never get updated. This is minor as it will early return immediately.
2. There're a few reasons blocklist may fail to be decrypted but they are not going to be recovered in next SetBlockList call.
   1. Node identity is incorrect. Node identity cannot be updated in run-time, only via restart. So the decrypt would always fail in SetBlockList.
   2. Blocklist is corrupted, either encryption error or invalid content. Still SetBlockList will continue to fail until another blocklist update.

In terms of code readability and cleanliness, moving h.lastBlockList updates to any place returning nil (including inside the empty check) is appropriate. But practically it is not creating any issues if I am not mistaken.

[thomas-nguy]

Blocklist is corrupted, either encryption error or invalid content. Still SetBlockList will continue to fail until another blocklist update.

Currently if the blocklist cannot be decrypted, it will fail only at the next block but from the next block, the error will be ignored. Is it your expected behavior?

[github-actions]

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