tpc_clusters.C - return null pointer if tree can be obtained from run-loader.

[u/mrichter/AliRoot.git] / EVE / alice-macros / tpc_clusters.C

diff --git a/EVE/alice-macros/tpc_clusters.C b/EVE/alice-macros/tpc_clusters.C
index 5d1ac09b5399158febbe10fb556a12d3067b9826..8f90458f54f5fe322e67a15e3a1b7c832a1023f2 100644 (file)
--- a/EVE/alice-macros/tpc_clusters.C
+++ b/EVE/alice-macros/tpc_clusters.C
@@ -30,19 +30,22 @@ TEvePointSet* tpc_clusters(TEveElement* cont=0, Float_t maxR=270)
 
   AliEveEventManager::AssertGeometry();
 
-  TEvePointSet* clusters = new TEvePointSet(kMaxCl);
-  clusters->SetOwnIds(kTRUE);
-
   AliRunLoader* rl = AliEveEventManager::AssertRunLoader();
   rl->LoadRecPoints("TPC");
 
-  AliTPCClustersRow *clrow=new AliTPCClustersRow();
+  TTree *cTree = rl->GetTreeR("TPC", false);
+  if (cTree == 0)
+    return 0;
+
+  AliTPCClustersRow *clrow = new AliTPCClustersRow();
   clrow->SetClass("AliTPCclusterMI");
   clrow->SetArray(kMaxCl);
-
-  TTree *cTree = rl->GetTreeR("TPC", false);
   cTree->SetBranchAddress("Segment", &clrow);
 
+  TEvePointSet* clusters = new TEvePointSet(kMaxCl);
+  clusters->SetOwnIds(kTRUE);
+
+
   Float_t maxRsqr = maxR*maxR;
   Int_t nentr=(Int_t)cTree->GetEntries();
   for (Int_t i=0; i<nentr; i++)