Werk #2569: fixed crash in aix lvm check after volume disappears

Component	Checks & agents
Title	fixed crash in aix lvm check after volume disappears
Date	Sep 3, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

after removing/renaming a lvm in aix the check would crash until rediscovery

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