A placement's served content (a funnel envelope, or nothing).
An unknown placement returns an empty envelope rather than a 404, so this
resolves with nothing to show instead of erroring — the caller renders
nothing, which is the behaviour a placement that has not been configured
yet should have.
A placement's served content (a funnel envelope, or nothing).
An unknown placement returns an empty envelope rather than a 404, so this resolves with nothing to show instead of erroring — the caller renders nothing, which is the behaviour a placement that has not been configured yet should have.