This MR fixes the b-tagging physics validation code to avoid the attempt to retrieve nonexistent aux data item SMT_mu_link. Tagging as urgent since it is needed by physics validation group.
On recent DAOD_PHYSVAL input with p4666, running the physics validation code (DAOD_PHYSVAL->NTUP_PHYSVAL) with doBtag leads to: PhysicsValidation 16:47:17 PhysValMonManager FATAL Standard std::exception is caught PhysicsValidation 16:47:17 PhysValMonManager ERROR SG::ExcBadAuxVar: Attempt to retrieve nonexistent aux data item `::SMT_mu_link' (882). PhysicsValidation 16:47:17 AthAlgSeq FATAL Standard std::excep
SMT is deprecated, the "new" soft muon variables are all called "softMuon_*". At the moment, SoftMu is turned off in FTAG code.