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"any" option with cascading dropdowns



I am using cascading dropdowns on a search form (Country/State/City). I use a custom entry for "-- Any --" and leave the value blank. I want the forms to ignore an "any" (blank) entry and not filter based on that value. Instead, when a dropdown is set to "any" (blank), the dependent dropdown shows only entries that have no value for that parameter.

For example, if I select Country="USA", State="-- Any --", the City dropdown shows only entries with a City value, but no State value. I would expect it, instead, to show all cities for entries in the USA.

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