Fix ROOT-6322: avoid adding empty autoload keys to the rootmaps
Fix ROOT-6322: avoid adding empty autoload keys to the rootmaps

The fix is trivial: check that the requested name is not empty.
Indeed an empty requested name is a "" and not a nullptr.

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