Remove a dead branch from ARGV.kegs
Remove a dead branch from ARGV.kegs

rack cannot be nil at the point where FormulaUnavailableError is raised,
so we don't need a branch to deal with that.

ilovezfs/brew,palxex/brew,MikeMcQuaid/brew,konqui/brew,Linuxbrew/brew,hanxue/linuxbrew,bfontaine/brew,mgrimes/brew,MikeMcQuaid/brew,ilovezfs/brew,nandub/brew,reitermarkus/brew,vitorgalvao/brew,bfontaine/brew,alyssais/brew,vitorgalvao/brew,bfontaine/brew,Homebrew/brew,AnastasiaSulyagina/brew,konqui/brew,jmsundar/brew,rwhogg/brew,staticfloat/brew,reelsense/brew,sjackman/homebrew,amar-laksh/brew_sudo,rwhogg/brew,EricFromCanada/brew,amar-laksh/brew_sudo,maxim-belkin/brew,claui/brew,aw1621107/brew,tonyg/homebrew,maxim-belkin/brew,Linuxbrew/brew,nandub/brew,ilovezfs/brew,zmwangx/brew,Homebrew/brew,MikeMcQuaid/brew,claui/brew,nandub/brew,sjackman/homebrew,nandub/brew,JCount/brew,JCount/brew,AnastasiaSulyagina/brew,gregory-nisbet/brew,staticfloat/brew,toonetown/homebrew,pseudocody/brew,EricFromCanada/brew,DomT4/brew,JCount/brew,reitermarkus/brew,konqui/brew,DomT4/brew,hanxue/linuxbrew,mistydemeo/homebrew,DomT4/brew,claui/brew,palxex/brew,gordonmcshane/homebrew,mistydemeo/homebrew,pseudocody/brew,gregory-nisbet/brew,mahori/brew,AnastasiaSulyagina/brew,muellermartin/dist,hanxue/linuxbrew,konqui/brew,muellermartin/dist,DomT4/brew,staticfloat/brew,jmsundar/brew,mahori/brew,mgrimes/brew,tonyg/homebrew,EricFromCanada/brew,mahori/brew,sjackman/homebrew,tonyg/homebrew,Linuxbrew/brew,reelsense/brew,EricFromCanada/brew,mgrimes/brew,maxim-belkin/brew,toonetown/homebrew,aw1621107/brew,reitermarkus/brew,Homebrew/brew,amar-laksh/brew_sudo,palxex/brew,pseudocody/brew,alyssais/brew,alyssais/brew,vitorgalvao/brew,gordonmcshane/homebrew,rwhogg/brew,reelsense/brew,Homebrew/brew,zmwangx/brew,Linuxbrew/brew,reitermarkus/brew,zmwangx/brew,vitorgalvao/brew,gregory-nisbet/brew,MikeMcQuaid/brew,claui/brew,toonetown/homebrew,mistydemeo/homebrew,gordonmcshane/homebrew,jmsundar/brew,sjackman/homebrew,aw1621107/brew,mahori/brew,JCount/brew,muellermartin/dist