Do not count an AS if it has no PeeringDB record.
Do not count an AS if it has no PeeringDB record.

When importing peering sessions from a router, some autonomous systems
where included in the total count of imported AS even if they were not
because they do not have any PeeringDB records.

Should fix a bug of display discussed in issue #13.

respawner/peering-manager,respawner/peering-manager,respawner/peering-manager,respawner/peering-manager