Fix Channel.close
Fix Channel.close

it did not immediately fulfill the .closed promise if $!queue was empty

usev6/rakudo,paultcochrane/rakudo,ungrim97/rakudo,teodozjan/rakudo,tony-o/deb-rakudodaily,MasterDuke17/rakudo,tony-o/deb-rakudodaily,tbrowder/rakudo,sergot/rakudo,awwaiid/rakudo,sjn/rakudo,niner/rakudo,dankogai/rakudo,sergot/rakudo,paultcochrane/rakudo,softmoth/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,samcv/rakudo,nunorc/rakudo,zhuomingliang/rakudo,awwaiid/rakudo,sjn/rakudo,tbrowder/rakudo,Gnouc/rakudo,rakudo/rakudo,tony-o/deb-rakudodaily,jonathanstowe/rakudo,LLFourn/rakudo,Leont/rakudo,dankogai/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,MasterDuke17/rakudo,labster/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,nbrown/rakudo,skids/rakudo,softmoth/rakudo,samcv/rakudo,softmoth/rakudo,ab5tract/rakudo,lucasbuchala/rakudo,ab5tract/rakudo,laben/rakudo,skids/rakudo,salortiz/rakudo,teodozjan/rakudo,LLFourn/rakudo,sjn/rakudo,jonathanstowe/rakudo,ugexe/rakudo,dankogai/rakudo,laben/rakudo,b2gills/rakudo,azawawi/rakudo,MasterDuke17/rakudo,ugexe/rakudo,usev6/rakudo,dankogai/rakudo,skids/rakudo,Gnouc/rakudo,samcv/rakudo,Leont/rakudo,lucasbuchala/rakudo,salortiz/rakudo,sergot/rakudo,cognominal/rakudo,cognominal/rakudo,nunorc/rakudo,tony-o/deb-rakudodaily,MasterDuke17/rakudo,skids/rakudo,nunorc/rakudo,Gnouc/rakudo,azawawi/rakudo,raydiak/rakudo,cognominal/rakudo,laben/rakudo,rakudo/rakudo,usev6/rakudo,tony-o/rakudo,niner/rakudo,salortiz/rakudo,ungrim97/rakudo,raydiak/rakudo,cognominal/rakudo,skids/rakudo,samcv/rakudo,jonathanstowe/rakudo,nbrown/rakudo,ugexe/rakudo,azawawi/rakudo,tony-o/rakudo,tbrowder/rakudo,rakudo/rakudo,laben/rakudo,zhuomingliang/rakudo,nbrown/rakudo,cygx/rakudo,zostay/rakudo,ungrim97/rakudo,LLFourn/rakudo,tony-o/deb-rakudodaily,LLFourn/rakudo,usev6/rakudo,paultcochrane/rakudo,sjn/rakudo,tbrowder/rakudo,ungrim97/rakudo,ab5tract/rakudo,raydiak/rakudo,awwaiid/rakudo,paultcochrane/rakudo,labster/rakudo,b2gills/rakudo,Leont/rakudo,sjn/rakudo,tony-o/rakudo,nunorc/rakudo,teodozjan/rakudo,LLFourn/rakudo,usev6/rakudo,b2gills/rakudo,raydiak/rakudo,cognominal/rakudo,nbrown/rakudo,zostay/rakudo,salortiz/rakudo,Gnouc/rakudo,cygx/rakudo,zostay/rakudo,zostay/rakudo,labster/rakudo,zhuomingliang/rakudo,ugexe/rakudo,paultcochrane/rakudo,nbrown/rakudo,cygx/rakudo,nbrown/rakudo,azawawi/rakudo,ugexe/rakudo,labster/rakudo,niner/rakudo,lucasbuchala/rakudo,tony-o/deb-rakudodaily,tony-o/rakudo,salortiz/rakudo,ab5tract/rakudo,b2gills/rakudo,samcv/rakudo,sergot/rakudo,cygx/rakudo,azawawi/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,zhuomingliang/rakudo,tony-o/rakudo,Gnouc/rakudo,cygx/rakudo,labster/rakudo,ungrim97/rakudo,tbrowder/rakudo,rakudo/rakudo,softmoth/rakudo,lucasbuchala/rakudo,Leont/rakudo,b2gills/rakudo,dankogai/rakudo,rakudo/rakudo,salortiz/rakudo,tony-o/rakudo,teodozjan/rakudo,tbrowder/rakudo,rakudo/rakudo,labster/rakudo,softmoth/rakudo,tony-o/deb-rakudodaily,jonathanstowe/rakudo,niner/rakudo