Fix a bug in AtlasPID: check the number of digits in the pid before finding the minimal/maximal, main

Andrii Verbytskyirequested to merge
averbyts/athena:fix_ATLASRECTS_7699 into main

Fix a bug in AtlasPID: check the number of digits in the pid before finding the minimal/maximal Fixes https://its.cern.ch/jira/browse/ATLASRECTS-7699

@amete @jchapman

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