Resolve "Map factory"

Closes #405 (closed)

include/core/map/map_base.h

@@ -72,6 +72,7 @@ class MapBase : public NodeBase, public std::enable_shared_from_this<MapBase>
         LandmarkBasePtrList landmark_list_;
 
     public:
+        MapBase();
         MapBase(ParamsMapBasePtr _params, const std::string& _type = "Base");
         WOLF_MAP_CREATE(MapBase, ParamsMapBase);