Hierarchy Level in slice causes no results to show

This is a follow up bug from https://www.flexmonster.com/question/bug-hierarchy-levels-are-not-ordered-according-to-result-of-members-request/
As a result of that issue, it was advised to remove the defaultHierarchySortName: 'unsorted' value from the options object.

We've now realized that this leads to an unexpected error: In instances where we have a Hierarchy's Level in either Columns or Rows, the values no longer show.

Specifically, if we have in the Slice something like

```

        "columns": [
            {
                "uniqueName": "Destination",
                "levelName": "Region Name",
            },
            ...
      }
```

With defaultHierarchySortName: 'unsorted' in Options our report looks like the attached image named with-unsorted-good.png

And without it, it looks like the attached image named no-unsorted-error.png.