Fixed pion duplication bug and replaced pion vertex check
See merge request !231 (merged) i.e. merge branch 'cherry-pick-c62ced01' into 'Sim09-upgrade'
(cherry picked from commit cb05535b)
589da13a Merge branch 'LHCBGAUSS-1272.DaughtersInLHCbAndCutsForDstar3pi' into 'Sim09'