Sweeping !27673 from 21.0 to 21.6. Protecting HepMCTruthReader against null signal vertex (!27854) · Merge requests · atlas / athena · GitLab

Atlas Nightlybuild requested to merge cherry-pick-413f51a190-21.6 into 21.6 Nov 10, 2019

Protecting HepMCTruthReader against null signal vertex

See merge request !27673 (merged)