Description of problem:

fetch:response:value always overrides the widget’s default value, which makes it impossible to start with an empty field. We need support for keeping the field empty until the user explicitly selects a value. Specifically:

• Add a config option like fetch:skipInitialValue: true to prevent setting an initial value

• Treat fetch:response:default: "" as a valid default

• Allow fetch:response:value to resolve to an empty string from JSONata expressions

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

 # <steps>

Actual results:

fetch:response:value always overrides the default and forces a value, even when we want the field to be empty.

Expected results:

The field can start empty even when fetch:response:value is configured, and empty-string results from JSONata are respected.

Reproducibility (Always/Intermittent/Only Once):

Build Details:

Additional info (Such as Logs, Screenshots, etc):