New Home Assistant 2023.7.1 Error "indicating it has a numeric value; however, it has the non-numeric value: '' (<class 'str'>)"

[MarcoAVoegele]

Hi Spali,
I just updated the Home Assistant version and now it does no longer work:
"
sensor:

• platform: command_line
  command: "/config/packages/e3dc/e3dc.sh"
  name: e3dc
  command_timeout: 1
  scan_interval: 1
  json_attributes:

  • result
    value_template: "OK"

• platform: template
  sensors:
  e3dc_grid_power:
  friendly_name: E3DC Netz
  device_class: power
  value_template: "{{ state_attr('sensor.e3dc', 'result')['EMS_POWER_GRID'] }}"
  unit_of_measurement: W
  "
  Home Assistant Log:
  "
  ...
  ValueError: Sensor sensor.e3dc_grid_power has device class 'power', state class 'None' unit 'W' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-numeric value: '' (<class 'str'>)
  "
  Do you have any suggestions?

Thank you,

Marco