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Hi Prefects, I’ve run into a problem when trying to `merge` two conditional branches back together, if the result of the previous step was a Pandas dataframe you get these errors; ```
[2019-10-09 09:27:02,948] INFO - prefect.TaskRunner | Task 'Merge': Starting task run...
[2019-10-09 09:27:02,961] ERROR - prefect.TaskRunner | Unexpected error: ValueError('The truth value of a DataFrame is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().')
...
[2019-10-09 09:27:02,965] INFO - prefect.TaskRunner | Task 'Merge': finished task run for task with final state: 'Failed'
```