Do not init TPC refitter if TPC is not requested

Author: shahor02

Detectors/GlobalTrackingWorkflow/study/src/TrackingStudy.cxx

@@ -143,15 +143,15 @@ void TrackingStudySpec::run(ProcessingContext& pc)
   o2::globaltracking::RecoContainer recoData;
   recoData.collectData(pc, *mDataRequest.get()); // select tracks of needed type, with minimal cuts, the real selected will be done in the vertexer
   updateTimeDependentParams(pc);                 // Make sure this is called after recoData.collectData, which may load some conditions
-
-  mTPCRefitter = std::make_unique<o2::gpu::GPUO2InterfaceRefit>(&recoData.inputsTPCclusters->clusterIndex, &mTPCCorrMapsLoader, o2::base::Propagator::Instance()->getNominalBz(),
-                                                                recoData.getTPCTracksClusterRefs().data(), 0, recoData.clusterShMapTPC.data(), recoData.occupancyMapTPC.data(),
-                                                                recoData.occupancyMapTPC.size(), nullptr, o2::base::Propagator::Instance());
-  mTPCRefitter->setTrackReferenceX(900); // disable propagation after refit by setting reference to value > 500
-  mNTPCOccBinLength = mTPCRefitter->getParam()->rec.tpc.occupancyMapTimeBins;
-  mTBinClOccBef.clear();
-  mTBinClOccAft.clear();
-
+  if (recoData.inputsTPCclusters) {
+    mTPCRefitter = std::make_unique<o2::gpu::GPUO2InterfaceRefit>(&recoData.inputsTPCclusters->clusterIndex, &mTPCCorrMapsLoader, o2::base::Propagator::Instance()->getNominalBz(),
+                                                                  recoData.getTPCTracksClusterRefs().data(), 0, recoData.clusterShMapTPC.data(), recoData.occupancyMapTPC.data(),
+                                                                  recoData.occupancyMapTPC.size(), nullptr, o2::base::Propagator::Instance());
+    mTPCRefitter->setTrackReferenceX(900); // disable propagation after refit by setting reference to value > 500
+    mNTPCOccBinLength = mTPCRefitter->getParam()->rec.tpc.occupancyMapTimeBins;
+    mTBinClOccBef.clear();
+    mTBinClOccAft.clear();
+  }
   // prepare TPC occupancy data
   if (mNTPCOccBinLength > 1 && recoData.occupancyMapTPC.size()) {
     mNTPCOccBinLengthInv = 1. / mNTPCOccBinLength;