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Check if person field is not empty


I'm on 2 SharePoint 2016 farms.
On the first one, I created workflow using conditional start on a person field. Let's call it "Notify a person".
The conditional start of this workflow is set by the following : 
         [Notify a person] is NOT EMPTY AND [Attachment] is TRUE then my WF start.

On my second farm, I couldn't reproduce this conditional start and I only have in the conditional start for a Person field,
         - is equal 
         - is not equal

I can't find the option NOT EMPTY...

Do you have any suggestion ?

I know that I could use the RUN IF but I prefere to reproduce first the 1st  solution.

Thanks for reading

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