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set the covariance to infinite if no beampost constraint and check the cavariance of each vertex

Ke Li requested to merge keli/athena:checkcov into master

There are several FPEs in the data22 reconstruction and caused by the negative covariance matrix from primary vertex, this MR will check the covariance for each vertex and skip it if the covariance is not correct, and it will set the default covariance to infinite if no beamspot constraint. Ping @kostyuk

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