Initialize hist_file; check whether it has been set before using it.
Initialize hist_file; check whether it has been set before using it.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@30738 27541ba8-7e3a-0410-8455-c3a389f83636

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