from Philippe: This prevent a crash in the case where         TTree::Draw is call with a zero length first arguments.
from Philippe:
This prevent a crash in the case where
        TTree::Draw is call with a zero length first arguments.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@5395 27541ba8-7e3a-0410-8455-c3a389f83636

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