Description of problem:
Looks like there is no sync_action file in proc for raid0 devices and raid-check script for cron reports an script error for these devices.

Version-Release number of selected component (if applicable):
mdadm-3.0-0.devel3.7.fc11.x86_64

How reproducible:
always

Steps to Reproduce:
1. create an raid0 device
2. run: /etc/cron.weekly/raid-check
  
Actual results:
[root@kvm2 ~]# /etc/cron.weekly/raid-check 
/etc/cron.weekly/raid-check: riadok 4: /sys/block/md2/md/sync_action: Adresár alebo súbor neexistuje

Expected results:
Nothing.

Additional info:
Please, update your list of devices to only those, which are redundant arrays.
You also can check, if there is /sys/block/md*/md/sync_action file for current device, if not, silently skip this device.