Feature request to suppress output header when no validations to report

A request from a customer:

"Currently the schema validation outputs blank entries for tables matching (with --filter-status=fail). Is it possible to suppress the table outputs in such cases?"

This would apply to all validation types. The customer is redirecting results to CSV and not storing them in BigQuery.

I've raised this on their behalf but we would need to think carefully about how this might effect other users or general usability.