Remove added check, not needed when thermostats without location are filtered

Author: bouwew

plugwise/helper.py

@@ -537,8 +537,6 @@ def presets(self, loc_id):
         rule_ids = self.rule_ids_by_tag(tag, loc_id)
         if rule_ids is None:
             rule_ids = self.rule_ids_by_name("Thermostat presets", loc_id)
-            if rule_ids is None:
-                return None
 
         for rule_id in rule_ids:
             directives = self._domain_objects.find(f'rule[@id="{rule_id}"]/directives')