Add safety check for empty match in TrdHitProducerQa, fix #2736

Refs #2736

changed milestone to %FEB23

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• af121b1b...20dd66c2 - 4 commits from branch computing:master
• defe3c06 - Add safety check for empty match in TrdHitProducerQa, fix #2736

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Dear @a.bercuci, @p.kaehler,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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• 207ac524 - 1 commit from branch computing:master
• bdcb8504 - Add safety check for empty match in TrdHitProducerQa, fix #2736

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So it is the TRD which occasionally produces digis with empty matches. I think the TRD guys should decide how to treat such cases in the QA. The way you fixed it here, one will never notice such cases.

@p.kaehler can you comment?

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