Bugfix for CbmSeedFinderQa

Bugfix for CbmSeedFinderQa: Pure-noise triggers lead to accessing the -1 element of an array, when determining the matched triggers per MC event. Fixed.

@f.uhlig @v.friese

reco/eventbuilder/digis/CbmSeedFinderQa.cxx

@@ -156,7+156,7 @@
   else {
     fvEventMatches.push_back(seedMatch);
     fvEventMatchesPerTs.push_back(seedMatch);
   }
 
   //correct digis in seed window
   for (int32_t iDigi = WinStart; iDigi <= WinEnd; iDigi++) {
@@ -202,7+202,7 @@
 
   for (uint32_t iSeed = 0; iSeed < fvEventMatchesPerTs.size(); iSeed++) {
     const CbmMatch eventMatch = fvEventMatchesPerTs.at(iSeed);
+    const CbmLink matchedLink = eventMatch.GetMatchedLink();
+    if (fEventList->GetEventIndex(matchedLink) == -1) { continue; }
+
     for (int32_t iLink = 0; iLink < eventMatch.GetNofLinks(); iLink++) {
       const CbmLink eventLink = eventMatch.GetLink(iLink);
       vLinkedTriggersPerMCEvent[fEventList->GetEventIndex(eventLink)]++;
     }
-    const CbmLink matchedLink = eventMatch.GetMatchedLink();
     vMatchedTriggersPerMCEvent[fEventList->GetEventIndex(matchedLink)]++;
   }
 
   for (uint32_t iSeed = 0; iSeed < fvEventMatchesPerTs.size(); iSeed++) {
     const CbmMatch eventMatch = fvEventMatchesPerTs.at(iSeed);
     const CbmLink matchedLink = eventMatch.GetMatchedLink();
+    if (fEventList->GetEventIndex(matchedLink) == -1) { continue; }
+
     if (vMatchedTriggersPerMCEvent[fEventList->GetEventIndex(matchedLink)] == 1) {
       const double seedTime = fvSeedTimesPerTs[iSeed];
       const double timeDiff = seedTime - fEventList->GetEventTime(matchedLink.GetEntry(), matchedLink.GetFile());