Sweeping !22217 from 21.3 to 21.9. Fix to always add a Dummy vertex to the FTK VertexContainer (!22243) · Merge requests · atlas / athena · GitLab

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Atlas Nightlybuild requested to merge cherry-pick-7621e8746b-21.9 into 21.9 Mar 29, 2019

Fix to always add a Dummy vertex to the FTK VertexContainer

See merge request !22217 (merged)