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Fix NDOF of tracks with no momentum information in PrKalmanFilter

Andrii Usachov requested to merge fix_velo_track_ndof into master

Take into account that number of track parameters is 4 (not 5) for tracks that don't have momentum measurement. This fixes weird chi2/ndf peaks for Velo tracks with very small number of hits and relatively large chi2 values, thanks @gunther for spotting this!

Goes with LHCb!4450 (merged)

Edited by Andrii Usachov

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