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Minor changes, protect against FPE in the ID Trigger monitoring

Mark Sutton requested to merge sutt/athena:tcs into 22.0

In ATR-25821 it is reported of crashes in the IDTrigger monitoring when running in multithreaded mode - although that may not be the fault to the ID Trigger monitoring.

As part of this it was noticed the there were some divide by zero FPE due to corrupted values of qOverP which were incorrectly set to 0, so giving rise to the FPE.

This protects against the division, but does not address what upstrwam code is producing or corrupting the data.

It seems to run in the more recently nightlies, although the reasons for the original crash are perhaps not yet understood.

Edited by Mark Sutton

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