fix tree

Author: alcaliva

PWGLF/TableProducer/Nuspex/coalescenceTreeProducer.cxx

@@ -71,7 +71,10 @@ struct CoalescenceTreeProducer {
 
   Preslice<aod::McParticles> mcParticlesPerMcCollision = aod::mcparticle::mcCollisionId;
 
-  OutputObj<TTree> treeBoundState{"treeBoundState", ""};
+  OutputObj<TTree> treeBoundState{
+    "treeBoundState",
+    OutputObjHandlingPolicy::AnalysisObject
+  };
 
   int64_t eventID = 0;                  // Event ID
   int64_t idB1 = 0, idB2 = 0, idB3 = 0; // MC particle IDs