Make getIsolate ensure that the VM has been loaded before checking for the isolate

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;
 
 /// A [ServiceObject] represents a persistent object within the vm.
 abstract class ServiceObject extends Observable {
   static int LexicalSortName(ServiceObject o1, ServiceObject o2) {
     return o1.name.compareTo(o2.name);
@@ skipping 263 matching lines @@
       _vmType = _stripRef(map['_vmType']);
     } else {
       _vmType = _type;
     }
 
     _update(map, mapIsRef);
   }
 
   // Updates internal state from [map]. [map] can be a reference.
   void _update(ObservableMap map, bool mapIsRef);
+
+  // Helper that can be passed to .catchError that ignores the error.
+  _ignoreError(error, stackTrace) {
+    // do nothing.
+  }
 }
 
 abstract class Coverage {
   // Following getters and functions will be provided by [ServiceObject].
   String get id;
   Isolate get isolate;
 
   /// Default handler for coverage data.
   void processCoverageData(List coverageData) {
     coverageData.forEach((scriptCoverage) {
@@ skipping 204 matching lines @@
     if (isolate == null) {
       // We should never see an unknown isolate here.
       throw new UnimplementedError();
     }
     return isolate;
   }
 
   // Note that this function does not reload the isolate if it found
   // in the cache.
   Future<ServiceObject> getIsolate(String isolateId) {
+    if (!loaded) {
+      // Trigger a VM load, then get the isolate.
+      return load().then((_) => getIsolate(isolateId)).catchError(_ignoreError);
+    }
     return new Future.value(_isolateCache[isolateId]);
   }
 
   dynamic _reviver(dynamic key, dynamic value) {
     return value;
   }
 
   ObservableMap _parseJSON(String response) {
     var map;
     try {
@@ skipping 2291 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);
     }
   }
 }