Draft: Backwards compatibility for 'hepmc_version' metadata (!60768) · Merge requests · atlas / athena · GitLab

Ewelina Maria Lobodzinska requested to merge ewelina-22.0-mc20-patch-52720 into 22.0-mc20 Feb 16, 2023

this MR was already accepted in master: !60609 (merged)

We need it also here, for fixing the metadata for MCEventCollection_p5