Move solution to pw-beta #280 into backend

Author: bouwew

plugwise/smile.py

@@ -483,9 +483,15 @@ async def _set_schedule_state_legacy(self, name: str, status: str) -> None:
         await self._request(uri, method="put", data=data)
 
     async def set_schedule_state(self, loc_id: str, name: str, state: str) -> None:
-        """Set the Schedule, with the given name, on the relevant Thermostat.
+        """Activate/deactivate the Schedule, with the given name, on the relevant Thermostat.
         Determined from - DOMAIN_OBJECTS.
+        In HA Core used to set the hvac_mode: in practice switch between schedule on - off.
         """
+        # Do nothing when name == None, meaning no schedule to activate / deactivate
+        # Also, don't through a error, as do nothing is the correct action in this scenario.
+        if name is None:
+            return
+
         if self._smile_legacy:
             await self._set_schedule_state_legacy(name, state)
             return