ignore download of missing boltdb files possibly removed during compaction #3563
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What this PR does / why we need it:
We fail the sync operation when we encounter an error while downloading any of the files from the tables. When a file goes missing we fail the sync and retry it next time. A file only goes missing when it gets compacted away by the compactor so we do not want to fail the sync when a file goes missing in the middle of the sync operation.
Checklist