It would be useful to add frontend-filter in the Data collection -> Hosts section, which would only display hosts without associated templates.

Currently, in Zabbix, you can create a host, assign it to a host group, and not link any templates to it. Such a host is valid, but there is no convenient filter in the host list that would allow you to quickly find only those hosts where the Templates field is empty.

Steps to reproduce:

1. Go to Data collection -> Hosts;
2. Create 1-st host (any name) for example "Host_1";
3. Assign any host group to it;
4. Save host;
5. Create 2-nd host (any name) for example "Host_2";
6. Assign the same host group as was for 1-st host;
7. Assign any existing template to this host;
8. Save host;
9. Go back to Data collection -> Hosts;
10. Try filtering the list so that only hosts without associated templates are displayed.

Result:

There is no filter in the frontend that would allow you to display only those hosts where the Templates field is empty.

Expected:

It should be possible to filter hosts by the status of their associated templates, for example:

Templates: empty / not empty;

or 

Without templates: yes/no

This would be helpful when auditing and cleaning up hosts that were added without templates