After unlinking a template in host configuration form (both - popup and standalone page), it is not possible to add it in templates multiselect via autocomplete menu, but it can still be added via select button (multiselect popup). 

Steps to reproduce:
1. Create a host and link any template to it.
2. Open just created host edit form.
2. Click on Unlink link next to the template name.
3. In Templates multiselect start typing the template name that was just unlinked.

Result: Autosuggest says "no matches found.
Expected: Autosuggest shows unlinked template.