HPCC-31525 Report a more specific error if part of an index file has been zeroed

[ghalliday]

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Testing:

[richardkchapman]

Is the crc32=0 a simpler/safer test, I wonder? Or is it 0 in the empty index case

[ghalliday]

Is the crc32=0 a simpler/safer test, I wonder? Or is it 0 in the empty index case

I'll check, but I think it is also be zero since keyBytes is 0. (The crc is checked when the node is loaded. Whether we should be doing that is a separate question...)

[ghalliday]

@richardkchapman test updated as you suggested - and tested locally.

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-31525

Jirabot Action Result:
Workflow Transition: Merge Pending
Updated PR
Assigning user: [email protected]