Merge branch 'cherry-pick-78611405ef-master' into 'master'

Cherry pick 78611405ef master

See merge request !4527

MuonSpectrometer/MuonTruthAlgs/src/MuonTruthDecorationAlg.cxx

@@ -467,6 +467,13 @@ namespace Muon {
         }
       }
     }
+    std::vector<float> emptyVec;
+    for( unsigned int i=0;i<m_trackRecordCollectionNames.size();i++){
+      const std::string name = m_trackRecordCollectionNames.at(i).key();
+      if(!truthParticle.isAvailable<std::vector<float> >(name+"_cov_extr")){
+	truthParticle.auxdata<std::vector<float> >(name+"_cov_extr")=emptyVec;
+      }
+    }
   }