torrc-defaults is not optional

      var torrcDefaultsFile =
                    TorLauncherUtil.getTorFile("torrc-defaults", false);

      var geoipFile = torrcDefaultsFile.clone();
      geoipFile.leafName = "geoip";

      var geoip6File = torrcDefaultsFile.clone();
      geoip6File.leafName = "geoip6";

      var args = [];
      if (torrcDefaultsFile)
      {
        args.push("--defaults-torrc");
        args.push(torrcDefaultsFile.path);
      }

Missed "optional" torrc-defaults file leads to exception and failed Tor start with unclear reason for user.