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Optimization of GenEventBarcodes property filling

John Derek Chapman requested to merge jchapman/athena:HepMC3_Overlay_part2_master into master

This merge request optimizes the filling of the GenEvent "barcodes" attribute to avoid unnecessary checks.
It also optimizes the fall back to querying the "barcode" attributes of individual GenParticle and GenVertex objects in the case that the "barcodes" attribute is not available for some reason. It should not change the output of any production step. NB The changes only affect HepMC3 builds, so the CI will not show any differences currently.

Tagging @averbyts

Edited by John Derek Chapman

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