Werk #15761: epower: Check levels if power is 0

Component	Checks & agents
Title	epower: Check levels if power is 0
Date	Jun 16, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Previously, Power phase service didn't check power against thresholds if power was 0.

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