Fix a potential error issue with get-info's domain

lib/get-info.js

@@ -23,7 +23,9 @@ var urlRetrieve = function (transport, options, callback) {
     // This should cut down on needing to restart the server
     var d = domain.create();
     d.on("error", function (err) {
+        if (typeof err.trace === "function") {
             Logger.errlog.log(err.trace());
+        }
         Logger.errlog.log("urlRetrieve failed: " + err);
         Logger.errlog.log("Request was: " + options.host + options.path);
         callback(503, err);