JetRec: Fix memory leak.

PseudoJetContainer needs to delete the objects in m_emptyExtractors.

Reconstruction/Jet/JetRec/JetRec/PseudoJetContainer.h

@@ -6,7 +6,7 @@
 #define PseudoJetContainer_H
 
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 
@@ -55,6 +55,8 @@ public:
                      const std::vector<PseudoJet> & vecPJ,
                      bool debug=false);
 
+  ~PseudoJetContainer();
+
   // fill xAOD jet with constit&ghosts extracted from final PSeudoJet
   bool extractConstituents(xAOD::Jet&, const std::vector<PseudoJet>&) const;
   bool extractConstituents(xAOD::Jet& jet, const PseudoJet &finalPJ) const;