Script Complete?

I’m writing a GH script using the ArchiCAD plugin. I’d like to generate a message for the user once the script has successfully completed, but not sure how.

The script culminates with a Slab Design component which generates a Slab in ArchiCAD (highlighted in green). The only output node from it seems to just output Null, regardless of what I do. I can see that the Slabs are being successfully generated though.

Any ideas if there’s a way to tell that the slabs have been generated in ArchiCAD?

Thanks, but it says Null both before and after I run the script. Maybe it’s an error with the Design Slab component, in that the output always just outputs Null regardless of what is going on.