The TopologyModelMhString Attribute is empty on devices added after the upgrade to the 10.4.1 version.
This attribute contains the values for the model handle of the containers the model belong to.
In Spectrum 10.4.1 this does not seem to be properly populated, and instead the attribute is left empty
Release : 10.4.1
Component : Spectrum Core / SpectroSERVER
This problem is resolved in DX NetOps 20.2 (Spectrum 10.4.2)