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xAODTau and tauRecTools: check element link validity in TauJet interface

Bertrand Martin Dit Latour requested to merge martindl/athena:R22_CheckLinkInInterface into master

Hello,

Similarly to !51930 (merged) , this MR is implementing a check on the validity of the tau -> seed jet element link before dereferencing it. Now, user code can safely retrieve tau->jet() without checking the link validity first. An invalid link (typically in AODs, where we don't store seed jets) will return nullptr for tau->jet().

Cheers, Bertrand

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