Werk #2993: zfs_arc_cache: fixed crash, no longer reports unknown if not all data is available

Component	Checks & agents
Title	zfs_arc_cache: fixed crash, no longer reports unknown if not all data is available
Date	Feb 17, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Fixed division by zero exception. Some zfs systems do not report all data, the check is now able to tolerate this.

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