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Update G4HadIntProcessor.cxx: nullptr check for invisible particles

Vincent Pascuzzi requested to merge FastChain/athena:21p3.fix.ISF_FatrasToolsG4.G4Step_invis into 21.3

Add conditional in finalize to ensure m_g4step is not null. This could be the case if we have events with only invisible particles (which do not have G4Steps).

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