Changed way Packs cannot be created if there is no Renderer.

core/cross/object_manager.h

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 178 matching lines @@
 
   // Dictionary of Objects indexed by their unique ID
   typedef std::map<Id, ObjectBase*> ObjectMap;
 
   ServiceLocator* service_locator_;
   ServiceImplementation<ObjectManager> service_;
 
   // Map of objects to Ids
   ObjectMap object_map_;
 
-  // Allow pack creation.
-  bool allow_pack_creation_;
-
   // Array required to maintain references to the currently live pack objects.
   PackRefArray pack_array_;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectManager);
 };
 }  // namespace o3d
 
 #endif  // O3D_CORE_CROSS_OBJECT_MANAGER_H_