Protecting HepMCTruthReader against null signal vertex
In some EVNT samples, the signal vertex is null. The code was segfaulting in those cases. This tweak protects against such a crash.
This is a manual sweep of !27673 (merged)
In some EVNT samples, the signal vertex is null. The code was segfaulting in those cases. This tweak protects against such a crash.
This is a manual sweep of !27673 (merged)