Steps to reproduce:

1. create a Host with 1 Zabbix Agent interface.
2. assign 1 Zabbix agent type item and 1 Zabbix agent (active) type item.
3. disable the Zabbix agent type item.
4. start Zabbix server and Zabbix agent (in passive and active mode).

Result:
Zabbix agent interface of the created Host overall status will be in status unknown. 
Expected:
Should be in status green. As we don't have have any passive items enabled, only Active checks should be counted in calculation of overall interface status.