Add check for no presets

Author: bouwew

plugwise/helper.py

@@ -648,16 +648,16 @@ def _control_state(self, loc_id: str) -> str | bool:
 
     def _presets_legacy(self) -> dict[str, list[float]]:
         """Helper-function for presets() - collect Presets for a legacy Anna."""
-        preset_dictionary: dict[str, list[float]] = {}
+        presets: dict[str, list[float]] = {}
         for directive in self._domain_objects.findall("rule/directives/when/then"):
             if directive is not None and "icon" in directive.keys():
                 # Ensure list of heating_setpoint, cooling_setpoint
-                preset_dictionary[directive.attrib["icon"]] = [
+                presets[directive.attrib["icon"]] = [
                     float(directive.attrib["temperature"]),
                     0,
                 ]
 
-        return preset_dictionary
+        return presets
 
     def _presets(self, loc_id: str) -> dict[str, list[float]]:
         """Collect Presets for a Thermostat based on location_id."""

plugwise/smile.py

@@ -547,7 +547,9 @@ async def _set_preset_legacy(self, preset: str) -> None:
 
     async def set_preset(self, loc_id: str, preset: str) -> None:
         """Set the given Preset on the relevant Thermostat - from LOCATIONS."""
-        if preset not in self._presets(loc_id):
+        if presets := self._presets(loc_id) is None:
+            raise PlugwiseError("Plugwise: no presets available.")
+        if preset not in presets:
             raise PlugwiseError("Plugwise: invalid preset.")
 
         if self._smile_legacy: