Update APC Humidity sensor

[NerdBlender]

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Would it be sensible to assume that if the APC humidity sensor is reading -1, then there is no humidity sensor attached? Happy to create a PR for this if it seems a sensible assumption.

[laf]

I'd say so yes, if -1 isn't a valid value then we should skip discovery of that sensor.

Most of the ones I add now all check for values of 0 or GT.

[lock]

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