Fix http requests and the crash dump RPC

runtime/observatory/lib/src/elements/debugger.dart

 // Copyright (c) 2014, 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.
 
 library debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/cli.dart';
@@ skipping 340 matching lines @@
 
 class AsyncNextCommand extends DebuggerCommand {
   AsyncNextCommand(Debugger debugger) : super(debugger, 'anext', []) {
   }
 
   Future run(List<String> args) async {
     if (debugger.isolatePaused()) {
       var event = debugger.isolate.pauseEvent;
       if (event.asyncContinuation == null) {
         debugger.console.print("No async continuation at this location");
-        return;
+      } else {
+        return debugger.isolate.asyncStepOver()[Isolate.kFirstResume];
       }
-      return debugger.isolate.asyncStepOver()[Isolate.kFirstResume];
     } else {
       debugger.console.print('The program is already running');
     }
   }
 
   String helpShort =
       'Step over await or yield';
 
   String helpLong =
       'Continue running the isolate until control returns to the current '
@@ skipping 1508 matching lines @@
         }
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }
-