[BUG] Fail when provisioning a setup with no spam/av

[stdevPavelmc]

Describe the bug
After the recent corrections, the services function on some scripts (restart services) is given for granted that all services are in place, when no av or spamd is configured it fails

So we must prepare that function for that: avoid handling the non functional services

[stdevPavelmc]

Closed by #73