v8 inspector: do not upon empty object ids in heap profiler.

src/inspector/v8-heap-profiler-agent-impl.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/inspector/v8-heap-profiler-agent-impl.h"
 
 #include "src/inspector/injected-script.h"
 #include "src/inspector/protocol/Protocol.h"
 #include "src/inspector/string-util.h"
 #include "src/inspector/v8-debugger.h"
@@ skipping 226 matching lines @@
 
   v8::HandleScope handles(m_isolate);
   v8::Local<v8::Object> heapObject = objectByHeapObjectId(m_isolate, id);
   if (heapObject.IsEmpty()) return Response::Error("Object is not available");
 
   if (!m_session->inspector()->client()->isInspectableHeapObject(heapObject))
     return Response::Error("Object is not available");
 
   *result = m_session->wrapObject(heapObject->CreationContext(), heapObject,
                                   objectGroup.fromMaybe(""), false);
-  if (!result) return Response::Error("Object is not available");
+  if (!*result) return Response::Error("Object is not available");
   return Response::OK();
 }
 
 Response V8HeapProfilerAgentImpl::addInspectedHeapObject(
     const String16& inspectedHeapObjectId) {
   bool ok;
   int id = inspectedHeapObjectId.toInteger(&ok);
   if (!ok) return Response::Error("Invalid heap snapshot object id");
 
   v8::HandleScope handles(m_isolate);
@@ skipping 115 matching lines @@
   if (!v8Profile)
     return Response::Error("Cannot access v8 sampled heap profile.");
   v8::AllocationProfile::Node* root = v8Profile->GetRootNode();
   *profile = protocol::HeapProfiler::SamplingHeapProfile::create()
                  .setHead(buildSampingHeapProfileNode(root))
                  .build();
   return Response::OK();
 }
 
 }  // namespace v8_inspector