added some error handling code.
added some error handling code.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@5803 27541ba8-7e3a-0410-8455-c3a389f83636

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