def check_repository_url
      url = Gitnesse::Config.instance.repository_url
      if url.nil? || url.empty?
        add_error "You must specify a repository_url to run Gitnesse"
      else
        true
      end
    end
def check_repository_url
      url = Gitnesse::Config.instance.repository_url
      if url.nil? || url.empty?
        add_error "You must specify a repository_url to run Gitnesse"
      else
        true
      end
    end
Checks that repository_url is set in Gitnesse::Config.

 Returns true or raises DependencyNotMetError if repository_url isn't set