Merge branch 'cherry-pick-bc5d2eaa [formerly 168f1c07c2]-master' into 'master'

Merge branch 'cherry-pick-bf9908a7' into '21.0'

See merge request !2823

Former-commit-id: 8e9da72e

Reconstruction/MuonIdentification/MuonCombinedBaseTools/src/MuonCreatorTool.cxx

@@ -1383,7 +1383,7 @@ namespace MuonCombined {
       }
       */
     }else{
-      ATH_MSG_ERROR("No primary track particle set, deleting muon");
+      ATH_MSG_DEBUG("No primary track particle set, deleting muon");
       return false;
     }