Fix IsThread destructor
Fix IsThread destructor

nounoursheureux/MCServer,nichwall/cuberite,tonibm19/cuberite,ionux/MCServer,nevercast/cuberite,QUSpilPrgm/cuberite,Frownigami1/cuberite,kevinr/cuberite,birkett/MCServer,SamOatesPlugins/cuberite,mjssw/cuberite,zackp30/cuberite,nichwall/cuberite,electromatter/cuberite,QUSpilPrgm/cuberite,linnemannr/MCServer,Howaner/MCServer,nounoursheureux/MCServer,Tri125/MCServer,Frownigami1/cuberite,nevercast/cuberite,mc-server/MCServer,electromatter/cuberite,linnemannr/MCServer,mmdk95/cuberite,tonibm19/cuberite,thetaeo/cuberite,kevinr/cuberite,bendl/cuberite,Altenius/cuberite,guijun/MCServer,marvinkopf/cuberite,Haxi52/cuberite,mc-server/MCServer,mc-server/MCServer,linnemannr/MCServer,Tri125/MCServer,bendl/cuberite,QUSpilPrgm/cuberite,birkett/MCServer,mjssw/cuberite,electromatter/cuberite,Schwertspize/cuberite,mc-server/MCServer,Fighter19/cuberite,mjssw/cuberite,birkett/cuberite,Frownigami1/cuberite,MuhammadWang/MCServer,linnemannr/MCServer,Altenius/cuberite,MuhammadWang/MCServer,linnemannr/MCServer,nounoursheureux/MCServer,electromatter/cuberite,nevercast/cuberite,kevinr/cuberite,QUSpilPrgm/cuberite,birkett/cuberite,guijun/MCServer,ionux/MCServer,ionux/MCServer,jammet/MCServer,johnsoch/cuberite,thetaeo/cuberite,nevercast/cuberite,nounoursheureux/MCServer,nevercast/cuberite,SamOatesPlugins/cuberite,marvinkopf/cuberite,SamOatesPlugins/cuberite,electromatter/cuberite,Schwertspize/cuberite,tonibm19/cuberite,guijun/MCServer,kevinr/cuberite,Howaner/MCServer,guijun/MCServer,tonibm19/cuberite,electromatter/cuberite,mjssw/cuberite,thetaeo/cuberite,Schwertspize/cuberite,HelenaKitty/EbooMC,Haxi52/cuberite,Schwertspize/cuberite,nichwall/cuberite,mc-server/MCServer,Howaner/MCServer,jammet/MCServer,SamOatesPlugins/cuberite,birkett/MCServer,birkett/cuberite,zackp30/cuberite,zackp30/cuberite,nicodinh/cuberite,thetaeo/cuberite,SamOatesPlugins/cuberite,Haxi52/cuberite,mmdk95/cuberite,marvinkopf/cuberite,nicodinh/cuberite,Tri125/MCServer,nichwall/cuberite,ionux/MCServer,zackp30/cuberite,nicodinh/cuberite,bendl/cuberite,kevinr/cuberite,Fighter19/cuberite,linnemannr/MCServer,nounoursheureux/MCServer,MuhammadWang/MCServer,Schwertspize/cuberite,mmdk95/cuberite,birkett/MCServer,nichwall/cuberite,jammet/MCServer,Altenius/cuberite,HelenaKitty/EbooMC,zackp30/cuberite,Altenius/cuberite,guijun/MCServer,birkett/MCServer,Tri125/MCServer,nicodinh/cuberite,marvinkopf/cuberite,Howaner/MCServer,nichwall/cuberite,HelenaKitty/EbooMC,bendl/cuberite,thetaeo/cuberite,MuhammadWang/MCServer,Howaner/MCServer,Frownigami1/cuberite,birkett/MCServer,Altenius/cuberite,Fighter19/cuberite,Fighter19/cuberite,nevercast/cuberite,johnsoch/cuberite,birkett/cuberite,johnsoch/cuberite,bendl/cuberite,jammet/MCServer,jammet/MCServer,HelenaKitty/EbooMC,QUSpilPrgm/cuberite,mjssw/cuberite,mc-server/MCServer,nicodinh/cuberite,Frownigami1/cuberite,birkett/cuberite,mmdk95/cuberite,mjssw/cuberite,mmdk95/cuberite,ionux/MCServer,nicodinh/cuberite,guijun/MCServer,Haxi52/cuberite,QUSpilPrgm/cuberite,thetaeo/cuberite,Fighter19/cuberite,tonibm19/cuberite,Howaner/MCServer,kevinr/cuberite,nounoursheureux/MCServer,Fighter19/cuberite,tonibm19/cuberite,ionux/MCServer,MuhammadWang/MCServer,johnsoch/cuberite,Haxi52/cuberite,jammet/MCServer,Haxi52/cuberite,zackp30/cuberite,birkett/cuberite,mmdk95/cuberite,Tri125/MCServer,marvinkopf/cuberite,HelenaKitty/EbooMC,marvinkopf/cuberite,Tri125/MCServer,johnsoch/cuberite