HPCC-33574 ActiveSpanScope false error message due to null spans

[jpmcmu]

• Corrected ActiveSpanScope logic for checking if active span has changed unexpectedly

Signed-off-by: James McMullan James.McMullan@lexisnexis.com

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-33574

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[jpmcmu]

This PR addresses an issue that causes spurious error logging when the ActiveSpanScope has a nullptr. Which can be useful to simplify code that tracks work being done that may or may not be related to a span.

[ghalliday]

@jpmcmu one question.

[ghalliday]

When was this occurring? Can you provide some more details - because I would expect span to never be null.

[jpmcmu]

@ghalliday The only place I am aware of is here in the dafilesrv code: https://github.com/hpcc-systems/HPCC-Platform/blob/master/fs/dafsserver/dafsserver.cpp#L1127