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Empty macro output union

Hamder83
11 - Bolide

Hi 

I have a small fow that I uses across different sources.

This flow converts excel files to alteryx databases and loads these instead of excel files if they are newer than the excel files.

So within my macro I have a directory with 2 file types.

When I run the workflow I want to union the two datasets. But my alteryx db load macro is always impty the first time I use the flow for a new source (since the alteryx databases is not yet generated).

But I passes the format of the file within the macroimage.png

This is the fields of the empty stream.
image.png

And this is for the stream with data:

 

image.png

How do I handle this?

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