Parrot revision for --version fix
Parrot revision for --version fix

Check to see that the Parrot rev is available before trying to use it.

Signed-off-by: Moritz Lenz <2b469823646c02e9f01a7ad5b893ceac76b06bbe@faui2k3.org>

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