Fixed isolate-shared-summary layout problems

runtime/observatory/lib/src/elements/isolate/shared_summary.dart

 // Copyright (c) 2016, 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:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/utils.dart';
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
@@ skipping 32 matching lines @@
   }
 
   @override
   void detached() {
     super.detached();
     children = [];
     _r.disable(notify: true);
   }
 
   void render() {
-    children = [];
-    if (_isolate.error != null) {
-      children = [
-        new PreElement()..classes = const ["errorBox"]
-          ..text = _isolate.error.message
-      ];
-    }
     final newHeapUsed = Utils.formatSize(_isolate.newSpace.used);
     final newHeapCapacity = Utils.formatSize(_isolate.newSpace.capacity);
     final oldHeapUsed = Utils.formatSize(_isolate.oldSpace.used);
     final oldHeapCapacity = Utils.formatSize(_isolate.oldSpace.capacity);
-    children.addAll([
+    final content = [
       new DivElement()..classes = ['menu']
         ..children = [
           new DivElement()..classes = const ['memberList']
             ..children = [
               new DivElement()..classes = const ['memberItem']
                 ..children = [
                   new DivElement()..classes = const ['memberName']
                     ..text = 'new heap',
                   new DivElement()..classes = const ['memberValue']
                     ..text = '$newHeapUsed of $newHeapCapacity',
@@ skipping 68 matching lines @@
                 ..text = 'ports'
             ],
           new DivElement()
             ..children = [
               new SpanElement()..text = 'see ',
               new AnchorElement(href: Uris.logging(_isolate))
                 ..text = 'logging'
             ]
       ],
       new IsolateCounterChartElement(_isolate.counters, queue: _r.queue)
-    ]);
+    ];
+    if (_isolate.error != null) {
+      children = [
+        new PreElement()..classes = const ['errorBox']
+          ..text = _isolate.error.message,
+        new DivElement()..classes = const ['summary']
+          ..children = content
+      ];
+    } else {
+      children = [
+        new DivElement()..classes = const ['summary']
+          ..children = content
+      ];
+    }
   }
 }