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Fix McEventCollection reproducibility on T->P->T

Tadej Novak requested to merge tadej/athena:mceventcoll into master

Child members of McEventCollection should not be initialised if blank. This fixes reproducibility of McEventCollection when going transient -> persistent -> transient (ATLASSIM-3598).

Also fixing two cases where HepMC3 members does not need to be instantiated. I would appreciate if @averbyts could check.

Running full-unit-tests to make sure nothing unexpected changes.

Edited by Tadej Novak

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