GravityView - Advanced Filtering Extension 4.0.4

#### Added
* `is empty` and `is not empty` operators for fields with predefined choices.
* Option to specify a custom value for the `contains` operator when fields have predefined choices.

#### Fixed
* Incorrect results returned when a `Current User Role` filter option was combined with another condition using an `OR` statement.
* PHP warning when filter condition value is left empty.
* Field conditional logic on a field from a joined form (via Multiple Forms extension) did not work.

* Removing all filters or the last one caused them to reappear after saving the View.

= 4.0.2 on August 29, 2024 =
This release fixes an issue with field comparisons involving merge tags and addresses a PHP 8.2 deprecation notice.

#### Fixed
* Incorrect results returned when comparing two fields, with the second field's value provided by a merge tag (e.g., "Field A is greater than {Field B:2}").
* PHP 8.2 deprecation notice due to passing a `null` value to json_decode().