HF-6877: Shared DMOBJ objects create empty blocks

This fixes an issue were a DMOBJ object is shared by two other objects. This misrepresents the objects and results in XML representation of data model for Nokia HDM contains empty parameter blocks, which it cannot parse

It seems like a rational thing to share an object, but in reality while the objects have same representation, they exist in two different places in the data model. This may be confusing internal operation of the implementation