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CaloThinCellsByClusterAlg and isValid check for serial run. Trying to fix e/gamma ART

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:CaloThinCellsByClusterAlg_check_valid into master

In egamma ART since 28/01/2020 we observe :

ESDtoAOD 12:59:39 CaloThinCellsByClusterAlg_InDetTrackParticlesAs...  FATAL  Standard std::exception is caught
ESDtoAOD 12:59:39 CaloThinCellsByClusterAlg_InDetTrackParticlesAs...  ERROR SG::ExcNullReadHandle: Dereference of read handle failed: StoreGateSvc_Impl+InDetTrackParticlesAssociatedClusters[1219821989]
ESDtoAOD 12:59:39 AthAlgSeq                                           FATAL  Standard std::exception is caught
ESDtoAOD 12:59:39 AthAlgSeq                                           ERROR SG::ExcNullReadHandle: Dereference of read handle failed: StoreGateSvc_Impl+InDetTrackParticlesAssociatedClusters[1219821989]
ESDtoAOD 12:59:39 AthAllAlgSeq                                        FATAL  Standard std::exception is caught
ESDtoAOD 12:59:39 AthAllAlgSeq                                        ERROR SG::ExcNullReadHandle: Dereference of read handle failed: StoreGateSvc_Impl+InDetTrackParticlesAssociatedClusters[1219821989]
ESDtoAOD 12:59:39 AthAlgEvtSeq                                        FATAL  Standard std::exception is caught
ESDtoAOD 12:59:39 AthAlgEvtSeq                                        ERROR SG::ExcNullReadHandle: Dereference of read handle failed: StoreGateSvc_Impl+InDetTrackParticlesAssociatedClusters[1219821989]
ESDtoAOD 12:59:39 AthMasterSeq                                        FATAL  Standard std::exception is caught
ESDtoAOD 12:59:39 AthMasterSeq                                        ERROR SG::ExcNullReadHandle: Dereference of read handle fail

Ths prb has more to do with !29831 (merged)

I do not readily see where we change det-flags (we do though doMuons=False).

Anyhow , this adds a check for "serial" running and gives a warning when the ReadHandle is not valid.

Mentioning @turra and @dboerner

Edited by Christos Anastopoulos

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