Hi Ian,
Please refer the follwing KB article that shows how to hide nested table that does not have child.
http://www.syncfusion.com/support/kb/721/How-to-hide-the-ChildTable-that-doesnSample can be accessed from the following link:
http://help.syncfusion.com/samples/kb/grid.windows/GGCHideEmptyChildTable/main.htmRegards,
Jisha