Update Roof.SlabShapeHasBeenModified.dyf

[denizmaral]

It fails when you have place-in families in the list. Now it will return null for the place-in family and for slabs it will return boolean value.

Purpose

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Changes

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Housekeeping

• [x] I am running the latest available version of Clockwork

[denizmaral]

better to do that in English version of Revit. Sorry for that.