AT:

• everywhere I have a search/filter input field in Optimize (e.g. variable filter, group by variable, alert modal, add report modal), the following behavior should be displayed: when we don't have any entries in the list:
  • show only one entry
  • the entry is not selectable
  • it is grayed out
  • the entry has a text saying "No results found." (similar to no-search-results.png)