only set scheduled temperatur if available

Climate/bosch_bth-ra_control_dev.yaml

@@ -159,6 +159,11 @@ actions:
         - service: switch.turn_off
           target:
             entity_id: "{{ window_detection_entity }}"
+        - if:
+            - condition: template
+              value_template: >
+                {{ scheduled_temperature is not none }}
+          then:
             - action: climate.set_temperature
               target:
                 entity_id: !input trv