Optional input in blueprint not working

Hi, I am trying to create a blueprint for an automation to turn on the light when I open the door. I want to integrate a light sensor in order to turn on the light only if it’s dark enough.
The tricky part is that I want to make the light sensor optional. This beats me.
I spent few days trying to figure this out, read other blueprints but I cannot understand what’s the issue.

Can anybody take a look?

blueprint:
  name: Test
  domain: automation
  
  input:
    door:
      name: Door
      default: ''
      selector:
        entity:
          domain: binary_sensor
          device_class: door
          multiple: false
                    
    light:
      name: Light
      selector:
        entity:
          domain: light
                        
    light_sensor:
      name: Light sensor
      default: ''
      selector:
        entity: 
          domain: sensor
          device_class: illuminance
        
variables: 
  light_sensor: !input light_sensor
  
trigger:
- platform: state  
  entity_id: !input door
  from: "off"
  to: "on"
    
action:
- choose:
  - conditions: "{{ light_sensor|length > 0 }}"
    sequence:
    - if:
      - condition: numeric_state
        entity_id: "light_sensor"
        below: 100
      then:
      - service: light.turn_on
        data: {}
        target:
          entity_id: !input light
  - default: 
    - service: light.turn_on
      data: {}
      target:
        entity_id: !input light

mode: single

The error I get at this moment:

Message malformed: Entity light_sensor is neither a valid entity ID nor a valid UUID for dictionary value @ data['action'][0]['choose'][0]['sequence'][0]['if'][0]['entity_id']

It looks like it ignores my choose condition

Thanks

Nobody? Any idea?

Nobody knows how to solve this thing?