Steps to reproduce:
1) Create host.
2) Create item.
3) Navigate to Monitoring->Latest data
4) Create new filter with Hosts field as - created Host before.
5) Check displayed data in table.

6) Navigate back to Configuration->Hosts
7) Delete Host created before.
8) Navigate to Monitoring->Latest data
9) Open your created filter and pressing Apply/Reset buttons check for result

Result:

Expected:
Should be no difference clicking on Update/Reset button in saved filter (after Hosts delete) because filter is empty.