**What happened**: Dropdown are broken **What you expected to happen**: Dropdown filter works **How to reproduce it (as minimally and precisely as possible)**: 1) Go to the Alerts Section 2) Open Query Builer 3) Add a new Filter and select a Field 4) Tryi to change "IS NOT NULL" or "IS ANYTHING" to another option  It should change and give the posibility to configure the filter It's happens using a ClickHouse Datasource.