A user can either include or exclude undefined/null value variables in a filter
Can also set a filter value

1. True value including null or undefined included in selection
   2. True value excluding null or undefined
   3. No true value (false value?), Null or undefined only 

 

 

Option one: Null and undefined implicit selection (see image attached)
con: selection of only null or undefined not clear

Option two: Null and undefined explicit selection (See image attached)