A dummy object for use in defining the description and notImportantMsg of Decoration objects to be generated by a Scenery object. If nullObj is placed as the second element of a decoration-defining list, , e.g. ['twigs', nullObj], then while the exitience of the object won't be denied, any attempt to refer to it will be met with "That's not something you need to refer to. "
nullObj : object
Our notImportantMsg is the same as our description. Game code is free to override this to something different if desired, but that might defeat the object, which is to make it clear to players that this object isn't anything they need to bother with.