Miscellaneous Observatory UI improvements

runtime/bin/vmservice/client/lib/src/elements/service_view.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.
 
 library service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/elements.dart';
@@ skipping 81 matching lines @@
         return element;
       case 'StackTrace':
         StackTraceElement element = new Element.tag('stack-trace');
         element.trace = object;
         return element;
       case 'VM':
         VMViewElement element = new Element.tag('vm-view');
         element.vm = object;
         return element;
       default:
-        return null;
+        JsonViewElement element = new Element.tag('json-view');
+        element.map = object;
+        return element;
     }
   }
 
   objectChanged(oldValue) {
     // Remove the current view.
     children.clear();
     if (object == null) {
       Logger.root.info('Viewing null object.');
       return;
     }
     var type = object.serviceType;
     var element = _constructElementForObject();
     if (element == null) {
       Logger.root.info('Unable to find a view element for \'${type}\'');
       return;
     }
     children.add(element);
     Logger.root.info('Viewing object of \'${type}\'');
   }
 }