doctor: fix undefined method `include?' for nil:NilClass

Closes https://github.com/Homebrew/homebrew-core/issues/2758
2016-07-06 16:18:24 +08:00 · 2016-07-06 16:18:24 +08:00 · cc01d3f59a
commit cc01d3f59a
parent ca005cb824
1 changed files with 1 additions and 0 deletions
--- a/Library/Homebrew/extend/os/mac/diagnostic.rb
+++ b/Library/Homebrew/extend/os/mac/diagnostic.rb
@ -314,6 +314,7 @@ module Homebrew
      end

      def check_for_beta_xquartz
+        return unless MacOS::XQuartz.version
        return unless MacOS::XQuartz.version.include? "beta"

        <<-EOS.undent