fix(segment): render detected empty batteries

[jin-li]

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Description

A valid battery at 0% is currently disabled before the battery segment can render.

Remove the percentage-based no-battery check so a successfully retrieved empty battery renders as 0%. NoBatteryError continues to handle computers without a battery.

Adds a regression test for a NotCharging battery at 0%.

Fixes #7782

[JanDeDobbeleer]

@all-contributors please add @jin-li for code

This is pure magic 🪄! @holopin-bot @jin-li wizard

[holopin-bot]

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[allcontributors]

@JanDeDobbeleer

I've put up a pull request to add @jin-li! 🎉