From Andrei: Adds a protection in the Merge function when the object to merge is missing.
From Andrei:
Adds a protection in the Merge function when the object to merge is missing.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@34450 27541ba8-7e3a-0410-8455-c3a389f83636

agarciamontoro/root,dfunke/root,root-mirror/root,Y--/root,gbitzes/root,buuck/root,omazapa/root,alexschlueter/cern-root,bbockelm/root,root-mirror/root,esakellari/my_root_for_test,mhuwiler/rootauto,agarciamontoro/root,zzxuanyuan/root,evgeny-boger/root,krafczyk/root,esakellari/root,arch1tect0r/root,evgeny-boger/root,sawenzel/root,omazapa/root,omazapa/root-old,beniz/root,nilqed/root,thomaskeck/root,olifre/root,jrtomps/root,georgtroska/root,smarinac/root,ffurano/root5,beniz/root,sawenzel/root,sawenzel/root,karies/root,cxx-hep/root-cern,mattkretz/root,esakellari/my_root_for_test,esakellari/my_root_for_test,mkret2/root,karies/root,gganis/root,krafczyk/root,alexschlueter/cern-root,zzxuanyuan/root-compressor-dummy,beniz/root,karies/root,agarciamontoro/root,gganis/root,omazapa/root,pspe/root,zzxuanyuan/root-compressor-dummy,BerserkerTroll/root,tc3t/qoot,krafczyk/root,davidlt/root,bbockelm/root,olifre/root,cxx-hep/root-cern,vukasinmilosevic/root,buuck/root,tc3t/qoot,cxx-hep/root-cern,jrtomps/root,zzxuanyuan/root,satyarth934/root,agarciamontoro/root,krafczyk/root,zzxuanyuan/root-compressor-dummy,dfunke/root,strykejern/TTreeReader,perovic/root,esakellari/my_root_for_test,abhinavmoudgil95/root,mhuwiler/rootauto,lgiommi/root,sirinath/root,esakellari/root,omazapa/root-old,thomaskeck/root,evgeny-boger/root,esakellari/root,CristinaCristescu/root,sirinath/root,vukasinmilosevic/root,karies/root,evgeny-boger/root,satyarth934/root,mkret2/root,sawenzel/root,sbinet/cxx-root,bbockelm/root,mkret2/root,omazapa/root-old,pspe/root,sirinath/root,kirbyherm/root-r-tools,pspe/root,sirinath/root,vukasinmilosevic/root,sawenzel/root,davidlt/root,thomaskeck/root,kirbyherm/root-r-tools,zzxuanyuan/root,lgiommi/root,satyarth934/root,karies/root,sawenzel/root,georgtroska/root,mattkretz/root,perovic/root,veprbl/root,krafczyk/root,olifre/root,zzxuanyuan/root-compressor-dummy,0x0all/ROOT,esakellari/my_root_for_test,perovic/root,gbitzes/root,0x0all/ROOT,Y--/root,mhuwiler/rootauto,0x0all/ROOT,esakellari/root,gbitzes/root,dfunke/root,omazapa/root,simonpf/root,beniz/root,perovic/root,buuck/root,kirbyherm/root-r-tools,ffurano/root5,mkret2/root,BerserkerTroll/root,gganis/root,olifre/root,omazapa/root,veprbl/root,jrtomps/root,evgeny-boger/root,esakellari/root,abhinavmoudgil95/root,abhinavmoudgil95/root,perovic/root,mattkretz/root,Duraznos/root,sbinet/cxx-root,tc3t/qoot,buuck/root,georgtroska/root,strykejern/TTreeReader,krafczyk/root,arch1tect0r/root,agarciamontoro/root,mattkretz/root,simonpf/root,simonpf/root,dfunke/root,mkret2/root,gbitzes/root,sirinath/root,lgiommi/root,alexschlueter/cern-root,sbinet/cxx-root,vukasinmilosevic/root,root-mirror/root,alexschlueter/cern-root,lgiommi/root,davidlt/root,abhinavmoudgil95/root,jrtomps/root,0x0all/ROOT,satyarth934/root,sirinath/root,tc3t/qoot,mhuwiler/rootauto,sbinet/cxx-root,perovic/root,beniz/root,Y--/root,CristinaCristescu/root,nilqed/root,veprbl/root,jrtomps/root,BerserkerTroll/root,arch1tect0r/root,arch1tect0r/root,vukasinmilosevic/root,cxx-hep/root-cern,sbinet/cxx-root,strykejern/TTreeReader,pspe/root,lgiommi/root,agarciamontoro/root,omazapa/root,zzxuanyuan/root,olifre/root,0x0all/ROOT,zzxuanyuan/root,mhuwiler/rootauto,davidlt/root,satyarth934/root,0x0all/ROOT,beniz/root,bbockelm/root,Dr15Jones/root,gbitzes/root,alexschlueter/cern-root,buuck/root,kirbyherm/root-r-tools,ffurano/root5,vukasinmilosevic/root,root-mirror/root,Duraznos/root,veprbl/root,abhinavmoudgil95/root,olifre/root,karies/root,mhuwiler/rootauto,agarciamontoro/root,karies/root,pspe/root,esakellari/my_root_for_test,Y--/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,sbinet/cxx-root,Dr15Jones/root,jrtomps/root,simonpf/root,vukasinmilosevic/root,agarciamontoro/root,beniz/root,mhuwiler/rootauto,satyarth934/root,pspe/root,arch1tect0r/root,sirinath/root,veprbl/root,BerserkerTroll/root,cxx-hep/root-cern,gganis/root,Y--/root,abhinavmoudgil95/root,gganis/root,dfunke/root,omazapa/root-old,davidlt/root,tc3t/qoot,veprbl/root,satyarth934/root,CristinaCristescu/root,davidlt/root,sawenzel/root,gbitzes/root,abhinavmoudgil95/root,georgtroska/root,perovic/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root,georgtroska/root,vukasinmilosevic/root,omazapa/root,CristinaCristescu/root,cxx-hep/root-cern,mkret2/root,buuck/root,smarinac/root,sawenzel/root,smarinac/root,esakellari/my_root_for_test,sawenzel/root,jrtomps/root,omazapa/root-old,mhuwiler/rootauto,davidlt/root,buuck/root,Y--/root,nilqed/root,veprbl/root,esakellari/my_root_for_test,gbitzes/root,veprbl/root,ffurano/root5,lgiommi/root,pspe/root,sbinet/cxx-root,BerserkerTroll/root,Y--/root,arch1tect0r/root,smarinac/root,dfunke/root,vukasinmilosevic/root,thomaskeck/root,strykejern/TTreeReader,karies/root,root-mirror/root,bbockelm/root,sbinet/cxx-root,beniz/root,Dr15Jones/root,dfunke/root,veprbl/root,BerserkerTroll/root,Y--/root,Duraznos/root,zzxuanyuan/root-compressor-dummy,Duraznos/root,BerserkerTroll/root,smarinac/root,satyarth934/root,Dr15Jones/root,esakellari/my_root_for_test,root-mirror/root,bbockelm/root,perovic/root,satyarth934/root,omazapa/root,CristinaCristescu/root,cxx-hep/root-cern,pspe/root,tc3t/qoot,omazapa/root-old,olifre/root,lgiommi/root,simonpf/root,abhinavmoudgil95/root,dfunke/root,georgtroska/root,gbitzes/root,cxx-hep/root-cern,arch1tect0r/root,mkret2/root,sawenzel/root,nilqed/root,esakellari/root,tc3t/qoot,pspe/root,evgeny-boger/root,root-mirror/root,mkret2/root,thomaskeck/root,gganis/root,smarinac/root,gganis/root,olifre/root,perovic/root,nilqed/root,CristinaCristescu/root,abhinavmoudgil95/root,mattkretz/root,veprbl/root,agarciamontoro/root,bbockelm/root,thomaskeck/root,0x0all/ROOT,esakellari/my_root_for_test,vukasinmilosevic/root,mkret2/root,krafczyk/root,gbitzes/root,davidlt/root,jrtomps/root,esakellari/root,BerserkerTroll/root,evgeny-boger/root,esakellari/root,bbockelm/root,alexschlueter/cern-root,mattkretz/root,tc3t/qoot,Dr15Jones/root,gganis/root,sirinath/root,smarinac/root,dfunke/root,abhinavmoudgil95/root,mhuwiler/rootauto,satyarth934/root,gbitzes/root,mattkretz/root,CristinaCristescu/root,zzxuanyuan/root,esakellari/root,olifre/root,mattkretz/root,sawenzel/root,simonpf/root,buuck/root,perovic/root,strykejern/TTreeReader,omazapa/root-old,mattkretz/root,abhinavmoudgil95/root,davidlt/root,jrtomps/root,karies/root,omazapa/root-old,mattkretz/root,tc3t/qoot,BerserkerTroll/root,Duraznos/root,jrtomps/root,ffurano/root5,nilqed/root,mkret2/root,strykejern/TTreeReader,agarciamontoro/root,thomaskeck/root,bbockelm/root,arch1tect0r/root,krafczyk/root,nilqed/root,CristinaCristescu/root,0x0all/ROOT,simonpf/root,sbinet/cxx-root,veprbl/root,CristinaCristescu/root,zzxuanyuan/root,strykejern/TTreeReader,omazapa/root-old,Duraznos/root,BerserkerTroll/root,krafczyk/root,karies/root,thomaskeck/root,perovic/root,simonpf/root,beniz/root,esakellari/root,thomaskeck/root,Y--/root,mattkretz/root,omazapa/root-old,arch1tect0r/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,mhuwiler/rootauto,karies/root,zzxuanyuan/root-compressor-dummy,bbockelm/root,lgiommi/root,lgiommi/root,gganis/root,buuck/root,simonpf/root,nilqed/root,zzxuanyuan/root-compressor-dummy,Dr15Jones/root,Duraznos/root,georgtroska/root,krafczyk/root,lgiommi/root,georgtroska/root,omazapa/root,root-mirror/root,ffurano/root5,Duraznos/root,nilqed/root,sirinath/root,davidlt/root,CristinaCristescu/root,smarinac/root,simonpf/root,gbitzes/root,georgtroska/root,gganis/root,satyarth934/root,olifre/root,sirinath/root,evgeny-boger/root,evgeny-boger/root,Duraznos/root,jrtomps/root,sirinath/root,olifre/root,Dr15Jones/root,sbinet/cxx-root,evgeny-boger/root,buuck/root,smarinac/root,tc3t/qoot,krafczyk/root,dfunke/root,Y--/root,beniz/root,gganis/root,sbinet/cxx-root,zzxuanyuan/root,smarinac/root,omazapa/root,georgtroska/root,0x0all/ROOT,buuck/root,mhuwiler/rootauto,nilqed/root,esakellari/root,davidlt/root,kirbyherm/root-r-tools,Duraznos/root,evgeny-boger/root,nilqed/root,mkret2/root,vukasinmilosevic/root,kirbyherm/root-r-tools,CristinaCristescu/root,pspe/root,zzxuanyuan/root,dfunke/root,bbockelm/root,thomaskeck/root,zzxuanyuan/root-compressor-dummy,georgtroska/root,beniz/root,BerserkerTroll/root,root-mirror/root,arch1tect0r/root,alexschlueter/cern-root,kirbyherm/root-r-tools,omazapa/root,lgiommi/root,arch1tect0r/root,omazapa/root-old,simonpf/root,ffurano/root5,Y--/root,pspe/root,Duraznos/root