Ignore empty "value_template" fields.

[apbarratt]

When creating a numeric_state trigger recently, I found that my automation stopped triggering.

When reviewing the yaml for the trigger, I found the following:

platform: numeric_state
entity_id: zone.home
below: 1
value_template: ""

I must have typed something briefly into the visual editor's value template field then removed it. I can think of no reason a person would deliberately set a value_template to an empty string (though happy to be corrected).

Suggested solution 1
I would suggest that here (and perhaps in other similar situations) the visual editor should remove value_template if it is set to an empty string.

Suggested solution 2
Alternatively, a small "unset" button of some sort next to optional fields might be valuable. Such a button would only become visible if indeed an input field has been set to a value at all and thus it would become quickly obvious when an unwanted empty value may cause issues. Or so is my thinking.

[apbarratt]

Thank you to Tinkerer on the Discord server for assistance figuring this one out for me :)