Add nullptr protection to PVConverter
Add nullptr protection to PVConverter in Pr/PrConverters/src/fromVectorLHCbRecVertexv2.cpp
since TrackBeamLineVertexFinderSOA
adds nullptr
to the list of tracks.
The entire algorithm is to be superseded with !1831 (closed).
needed by Moore!347 (merged)
Edited by Rosen Matev