Fix Sparkle strategy when only URLs but no versions are found.
Fix Sparkle strategy when only URLs but no versions are found.

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