Support undefined title in service_data

For example, this yaml should still work even when you don’t specify the title for the card:

type: entities
entities:
  - entity: light.kitchen_light
    tap_action:
      action: call-service
      service: browser_mod.popup
      service_data:
        card:
          type: entities
          entities:
            - light.kitchen_light
        deviceID:
          - this

You can display a blank string or fetch friendly_name or entity_id of the first specified entity in the card.

I’m not a developer and would love to help with little things like so I’m trying to set up a dev environment, learn github, home assistant development, etc. but it’s taking me a while.

[thomasloven]

service_data:
  ...
  hide_header: true

[thomasloven]

Thanks. Updated