Make sure that distances wrt to a merged component are always float max

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:KLMixture_reduction_do_not-recalculate_for_invalid into master

This is my guess for fixing the issue at ATLASRECTS-5571 ...

But as have not run a reproducer I might need some feedback from @wlampl

Edited by Christos Anastopoulos

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