Werk #1550: zfs_arc_cache: do not inventorize of no cache information available

Component	Checks & agents
Title	zfs_arc_cache: do not inventorize of no cache information available
Date	Nov 26, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This avoid an exception.

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