module SourcesHelper
  # Return HTML with a link to the the external source URL.
  def source_url_link(source)
    return link_to h(source.url), {}, { :rel => "nofollow", :target => "_BLANK" }
  end
end

module SourcesHelper
  # Return HTML with a link to the the external source URL.
  def source_url_link(source)
    return link_to h(source.url), source.url, { :rel => "nofollow", :target => "_BLANK" }
  end
end

Fix source_url_link to really link to the external link.
Fix source_url_link to really link to the external link.
