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Fix for precision error when computing Jet Tagging efficiency for Truth Tagging in PCBT mode

Nilotpal Kakati requested to merge nkakati/athena:21.2-nilotpal into 21.2

While computing efficiency for a given WP in PCBT mode (as a sum of the corresponding bin efficiencies), the MC Efficiency sometimes ends up being larger than 1 (precision error). This MR implements a check to handle such situations. (The issue only arises during computing Truth tagging weights)

Edited by Nilotpal Kakati

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