🐛 [bugfix] config parameters shouldn't be overriden by 'None' values

[xaf]

This would allow to reach situations with weird bugs as we could go around the _SENTINEL object by setting a value to None, which wouldn't be validated during the config check step.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
apps/qolsysgw
gateway.py	158	31	80%	95–96, 131–154, 162, 187–188, 216–217, 226–227, 236–237, 243, 263–264
apps/qolsysgw/mqtt
exceptions.py	17	0	100%
listener.py	53	8	85%	42–44, 68–70, 74–75
updater.py	241	9	96%	192, 195, 265, 328, 389, 394, 472, 513, 561
utils.py	20	0	100%
apps/qolsysgw/qolsys
actions.py	50	2	96%	24, 34
config.py	65	12	82%	61–62, 64, 68, 73, 88–100, 110, 139
control.py	151	7	95%	39, 47, 51, 58, 65, 81, 88
events.py	232	21	91%	64, 69, 100, 104, 130–131, 163, 167, 190, 201, 208, 235, 251, 265, 278–280, 325, 357, 369, 414
exceptions.py	29	0	100%
observable.py	17	3	82%	13, 17–18
partition.py	120	7	94%	149–153, 159–163, 166
sensors.py	179	22	88%	51–72, 116, 120, 126, 155, 159, 166, 183, 187
socket.py	93	19	80%	36, 43, 52–54, 83–84, 103–105, 109–110, 114–116, 126–127, 133–134
state.py	64	3	95%	24, 74, 82
utils.py	32	4	88%	10, 13, 19–20
TOTAL	1521	148	90%

Tests	Skipped	Failures	Errors	Time
111	0 💤	0 ❌	0 🔥	29.165s ⏱️