Fix nullptr dereference in service catalog

services/catalog/reader.cc

 // Copyright 2016 The Chromium 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 "services/catalog/reader.h"
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
@@ skipping 190 matching lines @@
 
 Reader::Reader(ManifestProvider* manifest_provider)
     : manifest_provider_(manifest_provider), weak_factory_(this) {
   PathService::Get(base::DIR_MODULE, &system_package_dir_);
 }
 
 void Reader::OnReadManifest(
     EntryCache* cache,
     const CreateEntryForNameCallback& entry_created_callback,
     std::unique_ptr<Entry> entry) {
+  if (!entry)
+    return;
   shell::mojom::ResolveResultPtr result =
       shell::mojom::ResolveResult::From(*entry);
   AddEntryToCache(cache, std::move(entry));
   entry_created_callback.Run(std::move(result));
 }
 
 }  // namespace catalog