'Failed to perform the action climate/set_preset_mode' error when attempting to use "Advance Schedule" feature, and the next schedule period heating is set to off.

[darthmorf]

Hello,

I've noticed an issue where if the next period in a schedule is set to "off", pressing "advance schedule" will result in the error: Failed to perform the action climate/set_preset_mode. '>=' not supported between instances of 'NoneType' and 'int'

This can be worked around by setting the period to a low temperature, e.g. 5°c instead of off.

[darthmorf]

I'm not familiar with developing for home assistant - it's possible that this is actually an issue with either the home assistant frontend or the wiser python API. From a brief browse of this repo and the wiser python api repo I couldn't obviously spot where this comparison that goes wrong is nor could I spot the error message. I figure you'd know better than me. Thanks