Allow "--- \n" as a yaml dumped result for nil.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Allow "--- \n" as a yaml dumped result for nil.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e