From Andreas: add check to not execute AliEn specific stuff if plugin does not exist.
From Andreas:
add check to not execute AliEn specific stuff if plugin does not exist.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@31059 27541ba8-7e3a-0410-8455-c3a389f83636

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