Add a protection in TCanvas::Draw in case the canvas has been read again from a file or socket since the previous Draw operation. Also add protections in the class against fCanvasImp=0
Add a protection in TCanvas::Draw in case the canvas has been read again from a file
or socket since the previous Draw operation.
Also add protections in the class against fCanvasImp=0


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@523 27541ba8-7e3a-0410-8455-c3a389f83636

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