Werk #7835: apc_symmetra: Treat unknown battery status as UNKNOWN instead of crashing

Component	Checks & agents
Title	apc_symmetra: Treat unknown battery status as UNKNOWN instead of crashing
Date	Jun 17, 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) 1.6.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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