handle case of unreachable block in is_optimstic helper
#6124
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When a non-canonical block is still in the DB, it can be accessed via `BlockId`, but `BlockRef` may be unavailable if the block was not properly cleaned when it got orphaned. Report it as optimistic.
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When a non-canonical block is still in the DB, it can be accessed via
BlockId, butBlockRefmay be unavailable if the block was not properly cleaned when it got orphaned. Report it as optimistic.