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Reducing number of warnings in MuonEfficiencyCorrections when missing dRJet decoration

Stefano Zambito requested to merge szambito/athena:MEC_ReduceWarnings into master

In the latest MCP prescriptions, isolation scale factors are provided in bins of muon pf and #Delta R(jet,#mu). The variable will be computed centrally in future derivations, and can be anyway decorated at analysis level by users. See

If the user forgets do so, or if TopoEM jets are missing from his/her derivations, the tool currently returns a warning and falls back to 1D scale factors. One set of warnings per muon, however, is probably too much. This MR reduces the number of thrown warnings to something we hope is more manageable.

Tagging @gartoni, @jojungge, @dzanzi, @mklein, @yoyamagu

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