Steps to reproduce
- Create a web content titled ""
- Create a blog titled ""
- Navigate to the search page
- Allow empty searches in the Search Options widget
- Add a Custom Filter widget to the search page with the following and click Apply:
Expected no search results since  is a null value
The web content and blog are both returned as search results
Tomcat 9.0.17 + MySQL 5.7
Portal master GIT ID: b4c0890a995af2912793ee3566ba58125d309ba0