There are a couple of other posts related to hiding a Group Header but I believe this circumstance is a bit different.
We have a hierarchical Grid with the following levels:
Track > Course > Lesson
The Lessons within a course are then grouped by Chapters. But some of the courses have no chapters - just a series of lessons. In those cases we want to hide the group header. It is not a case where there are no items, it is just that the related chapter grouping is "null".
Is there a way to check that if the group value that is returned is "null" (or a specific value if that is easier) and then hide the group header and expand/collapse button if that is the case?