Handle two ways that zfs can fail.

rules/solaris10/nrpe-host-auto.sh

@@ -23,9 +23,10 @@ trap "rm -f $FILESYSTEMS $ZPOOLS" 0
 # FIXME: We need a check_zpool command, that checks the status of the pool,
 # and the capacity of the root zfs of that pool, and maybe also recursively 
 # checks all child zfs.
-if [ -f /usr/sbin/zpool ]
+if [ -f /usr/sbin/zpool ] && [ -L /dev/zfs ]
 then
     /usr/sbin/zpool list -H -o name \
+    | grep -v 'no pools available' \
     | tee $ZPOOLS \
     | awk '{ 
         print "command[check-zfs-" $1 "]='$prefix'/libexec/check_zfs " $1