fix second trigger as trigger_variables was not defined

sync_trv_with_external_sensor.yaml

# # based on: https://community.home-assistant.io/t/tuya-radiator-valve-ts0601-calibration-from-external-sensor-via-zigbee2mqtt/337991
# # alternative: https://community.home-assistant.io/t/sync-trv-with-external-tempature-sensor/298024

blueprint:
  name: Temperature Calibration
  description: Temperature calibration for Zigbee valve TS0601, according to external temperature sensor
  domain: automation
  input:
    valve:
      name: Smart Valve
      selector:
        entity:
          domain: climate
    temp_sensor:
      name: Temperature Sensor
      selector:
        entity:
          domain: sensor
          device_class: temperature

variables:
  valve: !input valve
  temp_sensor: !input temp_sensor

trigger_variables:
  valve: !input valve
  temp_sensor: !input temp_sensor

trigger:
  - platform: time_pattern
    minutes: "/10"
  - platform: template
    value_template: "{{ ( state_attr(valve, 'current_temperature')|float - states(temp_sensor)|float)|abs > 0.25 }}"
    for: "00:00:02"
condition:
  condition: and
  conditions:
    - condition: template
      value_template: "{{ states(temp_sensor) != 'unavailable' }}"
    - condition: template
      value_template: "{{ states(temp_sensor) != 'unknown' }}"
    - condition: template
      value_template: "{{states(temp_sensor)|float(0) | round(1,'half') - (state_attr(valve,'current_temperature')|float(0) | round(1, 'half') - state_attr(valve,'local_temperature_calibration')|float(0) | round(1, 'half')) != state_attr(valve, 'local_temperature_calibration')|float(0) | round(1, 'half')}}"

action:
  - service: mqtt.publish
    data_template:
      topic: "zigbee2mqtt/{{valve.split('.')[1]}}/set/local_temperature_calibration"
      payload_template: >-
        {{states(temp_sensor)|float(0) | round(1,'half') - (state_attr(valve,'current_temperature')|float(0) | round(1, 'half') - state_attr(valve,'local_temperature_calibration')|float(0) | round(1, 'half'))}}