fixes uninstall if formula is unavailable
fixes uninstall if formula is unavailable

claui/brew,Homebrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,mahori/brew,EricFromCanada/brew,MikeMcQuaid/brew,reitermarkus/brew,reitermarkus/brew,vitorgalvao/brew,Homebrew/brew,JCount/brew,mahori/brew,vitorgalvao/brew,EricFromCanada/brew,sjackman/homebrew,sjackman/homebrew,mahori/brew,EricFromCanada/brew,JCount/brew,mahori/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,reitermarkus/brew,sjackman/homebrew,Homebrew/brew,Homebrew/brew,claui/brew,nandub/brew,nandub/brew,sjackman/homebrew,konqui/brew,JCount/brew,reitermarkus/brew,claui/brew,vitorgalvao/brew,claui/brew,nandub/brew,konqui/brew,JCount/brew,nandub/brew,konqui/brew,vitorgalvao/brew,konqui/brew