Werk #16328: primekey_hsm_battery_voltage: Fixed parsing of section when battery voltage is not available

Sometimes the battery voltage was not available or it wasn't a number. That cause the parsing of the section to fail. This has now been fixed. In the case of voltage being: 'External Battery: absence", the check status will be OK and the summary will provide details that the battery is absent. If the voltage is not a number or is not absent, the voltage check will be skipped and the check result will the battery state.

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