Do not fail production when consensus block value is unavailable #14111
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What type of PR is this?
Other
What does this PR do? Why is it needed?
We sometimes see sync committee signature verification failures when trying to get sync committee rewards for a given block. The reason for this bug is still unknown, but failing block production because of such a non-critical thing is too radical.
Which issues(s) does this PR fix?
Fixes #13910
Other notes for review
I modified the comment for Phase 0 to explain why we ignore it.