Client.onend: Anticipate that the HTTP parser object is uninitialized when the client setup failed.

lib/http.js

@@ -916,7 +916,7 @@ function Client ( ) {
   });
 
   self.onend = function () {
-    parser.finish();
+    if (parser) parser.finish();
     debug("self got end closing. readyState = " + self.readyState);
     self.end();
   };