Fix SonarCloud issue

Author: bouwew

plugwise/legacy/smile.py

@@ -171,9 +171,9 @@ async def set_preset(self, _: str, preset: str) -> None:
             raise PlugwiseError("Plugwise: invalid preset.")
 
         locator = f'rule/directives/when/then[@icon="{preset}"].../.../...'
-        rule = self._domain_objects.find(locator)
+        rule_id = self._domain_objects.find(locator).attrib["id"]
         data = (
-            f"<rules><rule id='{rule.attrib['id']}'><active>true</active></rule></rules>"
+            f"<rules><rule id='{rule_id}'><active>true</active></rule></rules>"
         )
         await self.call_request(RULES, method="put", data=data)