[Bug]: OpenAI `error in apply predictor step: unsupported operand type(s) for +: 'float' and 'str' `

[Ricram2]

Short description of current behavior

If you try to make a prediction with JOIN and the input data has NULL values, it will crash and give you: error in apply predictor step: unsupported operand type(s) for +: 'float' and 'str'

Video or screenshots

Expected behavior

Predict Null ?

How to reproduce the error

No response

Anything else?

No response

[tomhuds]

to discuss later today