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Avoid FPE in MSVertex eta calculation (ATLASRECTS-5523)

Nicolas Koehler requested to merge nkoehler/athena:fpeMsVtx into master

Hi,

this MRs adds a protection inside MSVertexRecoTool for cases where both x() and y() of the MSVertex position are 0. This leads to a floating point exception in Amg::Vector3D::eta() otherwise. The MR fixes ATLASRECTS-5523.

Best, Nico

Edited by Nicolas Koehler

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