Looks like you can get rid of this conditional and move the logic to the stage where the Presentation is being created (along with all the other fields) by doing something like

```python
row.get('Category', row.get('Level', ''))
```

If the Category field doesn't exist, fall back to using the Level field, and if that doesn't exist, use an empty string.

P.S. I earlier wrote this comment under one of your commits, but moving it under all changes so it's viewable with all the other comments.