Changing template from float(...) to (...) | float(0)

Configuration
6

There is no availability option in the GUI. So you would have to do this for the state template:

  {% if has_value('sensor.shellyplusht_kasse_temperature') and  
     has_value('sensor.shellyplusht_kasse_humidity') %}
    {{ ( 1000*e**(19.016-(4064.95/(states('sensor.shellyplusht_kasse_temperature') | float(0) +236.25)))*100/(461.66*(states('sensor.shellyplusht_kasse_temperature') | float(1) +273.15)) * (states('sensor.shellyplusht_kasse_humidity') | float(0))/100 ) | round (2) }}
  {% else %}
    {{ this.state }}
  {% endif %}

This will keep that last known good state if one of the sensors becomes unavailable.

Note I did not actually check the maths or syntax in your template. .

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