3415174 - Filter on blank attribute values with setSelectedMembers

SAC Story or Application with a filter using setSelectedMembers API

Go to story/app that is using setSelectedMembers as part of filtering code.
Filter on "ALL", expected details 

but unable to filter on the blank attribute
Filter on " ", not filtering the data.

by design

API - setSelectedMembers - doesn't support empty value.

KBA , LOD-ANA-AD , Analytics Designer , LOD-ANA-DES , Story Design & Visualizations , Problem