Sweeping !27673 from 21.0 to master. Protecting HepMCTruthReader against null signal vertex (!27855) · Merge requests · atlas / athena · GitLab

GitLab jobs artifacts no longer stored forever as of Monday, November 4th 08:30h. Further information under https://cern.ch/otg0152576

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

Protecting HepMCTruthReader against null signal vertex

See merge request !27673 (merged)