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TruthParticle: Adding extra test to parent/child

Zach Marshall requested to merge zmarshal/athena:21.2_ExtraCarefulChildCheck into 21.2

In some conditions a truth vertex (either production or decay) might be saved in a different collection from the daughters of a particle, causing the vertex to not know how many children or parents the particle has. This is particularly possible in case we save vertices for only some particles. An extra test lets us ensure that we avoid this case.

FYI @cdelitzs

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