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MCTruthClassifier: fix potential infinite loop

Christian Gutschow requested to merge cgutscho/athena:mctc_loops into master
  • Fix potential infinite loop if a particle doesn't have a parent.
  • Refactor to properly check cases with multiple parents (e.g. in 2->N splittings)

This is a more general solution to the issues outlined in !52281 (closed). (cc @ssnyder )

New logic validated against old one using PP8 ttbar and Sherpa W->taunu.

Edited by Christian Gutschow

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