Fix Sparkle detection if content type is missing.
Fix Sparkle detection if content type is missing.

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