Fix code display in Observatory

runtime/observatory/lib/src/service/object.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.
 
 part of service;
 
 /// An RpcException represents an exceptional event that happened
 /// while invoking an rpc.
 abstract class RpcException implements Exception {
   RpcException(this.message);
@@ skipping 2801 matching lines @@
     if (script != null) {
       // Already done.
       return;
     }
     if (kind != CodeKind.Dart){
       return;
     }
     if (function == null) {
       return;
     }
-    if (function.location.script == null) {
+    if ((function.location == null) ||
+        (function.location.script == null)) {
       // Attempt to load the function.
       function.load().then((func) {
         var script = function.location.script;
         if (script == null) {
           // Function doesn't have an associated script.
           return;
         }
         // Load the script and then update descriptors.
         script.load().then(_updateDescriptors);
       });
@@ skipping 434 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }