Fix null values being applied to filters with click behavior custom URL links (#40023) (#40323)

* do not pass null values to link url

* update null check to include query builder nulls replaced with "(empty")

* add test to verify behavior

* replace magic string with constant

* fix breakout in cypress spec

Co-authored-by: Jesse Devaney <22608765+JesseSDevaney@users.noreply.github.com>