fix for controller with no arrays created

I have this same problem: http://hwraid.le-vert.net/ticket/96
Before patch:
sas2ircu-status --nagios
RAID ERROR - Arrays: OK:1 Bad:1 - Disks: OK:8 Bad:0
After patch:
sas2ircu-status --nagios
RAID OK - Arrays: OK:1 Bad:0 - Disks: OK:8 Bad:0

Thanks!
Joe