SNMP availbility icon is green when all SNMP agent items are "not supported"

Steps to reproduce:

1. Set up SNMPv3 monitoring of a host
2. Correctly configure passhphrases
3. Configure the security name incorrectly

Result:
The host "SNMP" availability icon is green
Despite all the "SNMP agent" items are in "not supported" state with "Unknown user name" error
Expected:
The host "SNMP" availability icon is red with  "Unknown user name" error