Empty predicate no longer uses null fields
Fixed bug with predicates using the wrong field for names
Fixed regression introduced by empty predicate changes
Revert "Edits on filters are cancelled on focus lost"

This reverts commit 158c63a59be7fe94a1a611206fa255ee7f22d445.
Parent issues themselves show up when filtering by parent id
Fixed issues with parent sorting by wrapping the filtered list in a sorted list, instead of vice versa