Merge branch 'tstreble-master-patch-16171' into 'master'

Add missing truth link validity check in InDetTrackTruthOriginTool [fix ATR-26337]

Closes ATR-26337

See merge request atlas/athena!56913

PhysicsAnalysis/TrackingID/InDetTrackSystematicsTools/Root/InDetTrackTruthOriginTool.cxx

@@ -169,7 +169,7 @@ namespace InDet {
 
 	bool isFromHSProdVtx = false;
 	for (const auto& link : links){
-	  if(truth == *link){
+	  if(link.isValid() && truth == *link){
 	    isFromHSProdVtx = true;
 	    break;
 	  }