Werk #12777: dell_poweredge_amperage: fix ValueError crash

Component	Checks & agents
Title	dell_poweredge_amperage: fix ValueError crash
Date	Apr 16, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

dell_poweredge_amperage check crashed when a probe was in unknown state. The state is now checked and reported as UNKN to checkmk.

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