Template sensor change

[horbye]

Since recent changes in HA, I got some errors in the log file
has device class 'None', state class 'None' unit 'State' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-numeric value: '' (<class 'str'>) value

Removed this line, from each template sensor, solved it
unit_of_measurement: "State"

So they look like this:
sensor:

• platform: template
  sensors:
  komfovent_on_off:
  friendly_name: "Komfovent On Off"
  value_template: >-
  {% set mapper = {
  '0' : 'Off',
  '1' : 'On'} %}
  {% set state = states('sensor.komfovent_on_off_num') %}
  {{ mapper[state] if state in mapper else 'Unknown' }}