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tauRecTools: retrieve the orignal cluster only when jet performs vertex correction (ATLASRECTS-5763)

Xiaozhong Huang requested to merge xiaozhon/athena:fix_crash into master

In TauClusterFinder, we retrieve the orignal cluster via a decorated link. However, if there is no vertex correction in jet reconstruction, then the returned original cluster will be nullptr, which result in a crash.

To fix this, we retrieve the orignal cluster only when jet performs vertex correction.

In addition, a flag of SkipNegativeEnergy is added to control the removal of cluster with rawE <= 0

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