Is there a way to remove the child row functionality and icon for rows that do not have an specific array set.
Row 1 - d.array isset
Row 2 - d.array isnotset
Row 3 - d.array isset
Child rows (show extra / detailed information)
Absolutely, just don't render in the button. Perhaps the easiest option would be to use createdRow and add a class to any rows which do have child row information. Then you can use that class for both the icon display and the event handler selector.
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