Formulae require at least a URL

[tommasongr]

Hi there,

I'm opening this because a user of our Homebrew client (brewerx.app) has reported an issue with the repository.

We discovered that the vagrant formula is not providing the required url for OSs besides Linux. Causing Homebrew to spin up this issue:

Error: formulae require at least a URL
/opt/homebrew/Library/Homebrew/formula.rb:306:in 'determine_active_spec'
/opt/homebrew/Library/Homebrew/formula.rb:237:in ' initialize' /opt/homebrew/Library/Homebrew/formulary.rb:492:in 'new'
/opt/homebrew/Library/Homebrew/formulary.rb:492:in 'get_formula'
/opt/homebrew/Library/Homebrew/formulary.rb:732 in 'factory'
/opt/homebrew/Library/Taps/paninihouse/homebrew-brewer-cmd/cmd/ brewer-tap-content-info.rb:37:in 'block (2 levels) in brewer_tap_content_info'
/opt/homebrew/Library/Taps/paninihouse/homebrew-brewer-cmd/cmd/ brewer-tap-content-info.rb:36:in 'each'
/opt/homebrew/Library/Taps/paninihouse/homebrew-brewer-cmd/cmd/ brewer-tap-content-info.rb:36:in 'block in brewer_tap_content_info' /opt/homebrew/Library/Homebrew/tap.rb:826:in 'block (2 levels) in each' /opt/homebrew/Library/Homebrew/tap.rb:825 in 'each' /opt/homebrew/Library/Homebrew/tap.rb:825:in 'block in each' /opt/homebrew/Library/Homebrew/tap.rb:824 in 'each' /opt/homebrew/Library/Homebrew/tap.rb:824:in 'each'
/opt/homebrew/Library/Taps/paninihouse/homebrew-brewer-cmd/cmd/ brewer-tap-content-info.rb:34:in 'brewer_tap_content_info' /opt/homebrew/Library/Homebrew/brew.rb:86:in <main>'

If you weren't aware, please consider to fix the malformed files.

Thanks