Graphlet disappearing after filtering through a null set

[#1]

Have a tool I built that has a series of graphlets in them.  Noticed some odd behavior.  The top-level graph has a local data filter.  Some combinations of that data filter will result in no data.  When I filter to a no-data set, then expand back to a set with data, the graphlet no longer exists. 

Any ideas on how to retain the graphlets after filtering?