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gRoo is the edep sim "pass through" tree
DetSimPassThru/gRooTracker
which holds the genie information. For neutrino events, it's always there. But particle guns are missing this info. That's why it's important to check that it exists before trying to read from it. One check was missing and this PR adds it to fix issue #123. It also removes the cout for slicesI don't have the particle gun datasets so I wasn't able to test on those, but I imagine it'll work. Someone should please try