GravityView - Advanced Filtering Extension 4.0.4

* Fixed: "is empty" and "is not empty" filters not working for Date fields

* Added: Conditionally display configured fields based on logic rules
- Define content that is displayed when the field is not shown
* Added: Specify custom value when "is" operator is used in combination with predefined select values
* Added: Support for filtering by a multiple-choice field option that has no label
* Fixed: Advanced Filter not initializing when a View is created from within the form editor
* Fixed: PHP warning

* Added: "Is Empty" and "Is Not Empty" filter condition operators
* Fixed: Entries with empty field values showing up in results despite having the proper filter condition in place