avoid using undefined variable in error handling

Author: grs

lib/bridges.js

@@ -168,7 +168,7 @@ HttpToAmqpBridge.prototype.request = function (request, response) {
             console.error(error);
             response.statusCode = 500;
             response.end(error.toString());
-            metrics.http_ingress_request(self.metrics, client_ip(request.socket), request.method, response.statusCode, site, message_out.body ? message_out.body.length : 0, error.toString().length, elapsed(start));
+            metrics.http_ingress_request(self.metrics, client_ip(request.socket), request.method, response.statusCode, undefined, message_out.body ? message_out.body.length : 0, error.toString().length, elapsed(start));
         });
     });
 };