Sweeping !22633 from 21.3 to 21.9. HepMcParticleLink robustness improvements (!22745) · Merge requests · atlas / athena · GitLab

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Atlas Nightlybuild requested to merge cherry-pick-46f2107fdf-21.9 into 21.9 Apr 17, 2019

HepMcParticleLink robustness improvements

See merge request !22633 (merged)