MCTruthSimAlgs: Make sure the GenVertexPtr is not null before dereferencing it
The title explains it all. I think this was overlooked in !39619 (merged).
Closes ATLASSIM-5070
cc: @jchapman
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The title explains it all. I think this was overlooked in !39619 (merged).
Closes ATLASSIM-5070
cc: @jchapman