 o) prevent possible crash when printing null TTree
 o) prevent possible crash when printing null TTree


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@26816 27541ba8-7e3a-0410-8455-c3a389f83636

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