Use boilerplate default when survey value is an empty string

Description

Please ensure all of these TODOs are completed before asking for a review.

[ ] Ensure the branch is named correctly with the issue number. e.g: feature/new-vpc-endpoints-955 or bug/missing-count-param-434.
[ ] Update the docs.
[ ] Keep the changes backward compatible where possible.
[ ] Run the pre-commit checks successfully.
[ ] Run the relevant tests successfully.
[ ] Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.