luci-app-statistics: add watt-ups for nut and skip unsupported values
Only render NUT charts for actually available data and add a chart
definition for `watt-ups` values while we're at it.
Ref: https://forum.openwrt.org/t/x/156246
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
parent
6b9a985f
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