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FPE fix in MSVertexRecoAlg

Johannes Junggeburth requested to merge (removed):ATLASRECTS-5975 into master

Hi everbody,

this ticket closes ATLASRECTS-5975, where a FPE in the MSVertexRecoAlg. @wlampl found out that the issue is happening during the chi2 minimization where the derivative becomes essentially zero. Thanks a lot for these studies. In these cases, we are lost and can only abort the minimization which is done in this MR apart from few indentation and caching fixes.

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