[homekit] return min value of characteristic instead of 0 #11803
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a characteristic can have min value, defined either by HAP standard or via openHAB configuration, different to 0.
the current implementation was returning 0 in case openHAB item state is null, independent of defined min value.
this PR make sure that min value is returned in such cases.
fix for #9722
Signed-off-by: Eugen Freiter freiter@gmx.de