cask/audit: fix audit error when homepage is missing
cask/audit: fix audit error when homepage is missing

JCount/brew,MikeMcQuaid/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,Homebrew/brew,Homebrew/brew,nandub/brew,nandub/brew,Homebrew/brew,nandub/brew,JCount/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew