Model Registry: Empty state for empty description

The following discussion from !162759 (merged) should be addressed:

• @mfluharty started a discussion: (+1 comment)

  question (non-blocking): If the model has no description, then the empty state is shown even if the model has some versions, which feels weird because it has a Create model version call-to-action when I have already created some model versions - is this expected?: 🤔