Sweeping !23142 from 21.3 to master. add UseCSC property to MuonIdHelperTool in case no CSCs are present anymore (!23449) · Merge requests · atlas / athena · GitLab

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Atlas Nightlybuild requested to merge cherry-pick-7c2a4e4021-master into master May 15, 2019

add UseCSC property to MuonIdHelperTool in case no CSCs are present anymore

See merge request !23142 (merged)