Werk #8822: 3par_hosts: Do not crash if OS info is missing

Component	Checks & agents
Title	3par_hosts: Do not crash if OS info is missing
Date	Jul 30, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p22 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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