Filtering for contacts or contactgroups lists hosts they're not notified about

[nilmerg]

Describe the bug

Filter in the host list for contacts or contactgroups. You'll notice that you get hosts where such a contact or group is notified about one of its services. They are not notified about the host, however.

To Reproduce

1. Have a host
2. Have a service on that host
3. Configuration notifications for that service
4. But not for the host
5. Search with user.name=... in the host list

Expected behavior

• The host doesn't appear in the host list (host.user.name)
• The service appears in the service list (service.user.name)

If such a filter is used as restriction:

• Clicking on the host link (service list) or host tab (detail) a 404 appears

Additional context

ref/IP/52109

[tbauriedel]

ref/NC/808613