Remove broken hits (negative eloss) from TRD branch in AT converter

Trd hits with negative energy loss are still stored for position information. However, they should not be used to calculate the energy loss and therefor need to be removed in AT converter. This should fix the issues reported in https://redmine.cbm.gsi.de/issues/3180 https://redmine.cbm.gsi.de/issues/3182

analysis/common/analysis_tree_converter/CbmTrdTracksConverter.cxx

@@ -92,7 +92,6 @@ void CbmTrdTracksConverter::ProcessData(CbmEvent* event)
     trd_track->GetParamLast()->Momentum(mom_last);
 
     track.SetMomentum3(mom);
-    track.SetField(int(trd_track->GetNofHits()), i_n_hits_);
 
     track.SetField(float(trd_track->GetPidLikeEL()), i_pid_like_);
     track.SetField(float(trd_track->GetPidLikePI()), i_pid_like_ + 1);
@@ -109,15 +108,22 @@ void CbmTrdTracksConverter::ProcessData(CbmEvent* event)
       track.SetField(0.f, i_e_loss_i_ + i);
     }
 
+    int trd_hits = trd_track->GetNofHits();
     for (Int_t ihit = 0; ihit < trd_track->GetNofHits(); ihit++) {
       Int_t idx = trd_track->GetHitIndex(ihit);
       auto* hit = (CbmTrdHit*) cbm_trd_hits_->At(idx);
       if (hit) {
-        //        std::cout << hit->GetELoss()*1e6 << "  " << hit->GetPlaneId() << std::endl;
-        track.SetField(float(hit->GetELoss() * 1e6), i_e_loss_i_ + hit->GetPlaneId());
+        if (hit->GetELoss() > 0) {
+          track.SetField(float(hit->GetELoss() * 1e6), i_e_loss_i_ + hit->GetPlaneId());
+        }
+        else {
+          trd_hits--;
+        }
       }
     }
 
+    track.SetField(trd_hits, i_n_hits_);
+
     if (rec_tracks_map.empty()) { continue; }
     const Int_t stsTrackIndex = global_track->GetStsTrackIndex();
     if (rec_tracks_map.find(stsTrackIndex) != rec_tracks_map.end()) {