Add more error handling to test

tests/standalone/io/http_server_early_client_close_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 
 void sendData(List<int> data, int port) {
   Socket.connect("127.0.0.1", port).then((socket) {
@@ skipping 134 matching lines @@
             server.close();
           });
     });
     Socket.connect("localhost", server.port)
         .then((socket) {
           socket.write("GET / HTTP/1.1\r\n");
           socket.write("Content-Length: 10\r\n");
           socket.write("\r\n");
           socket.write("data");
           socket.close();
-          socket.listen((_) {});
+          socket.listen((_) {}, onError: (_) {});
+          socket.done.catchError((_) {});
         });
   });
 }
 
 void main() {
   testEarlyClose1();
   testEarlyClose2();
   testEarlyClose3();
 }