Silence the "org-ql: No headings in buffer: %s" ?

This is a minor thing, but the "org-ql: No headings in buffer: %s" message on empty buffers is a bit annoying when using ql non-interactively. (I have an agenda buffer filled by an ical subscription, it's often empty …) Could that message perhaps only be sent if called interactively, or perhaps there could be some variable we can set? Or should we just inhibit-message when calling org-ql (feels a bit heavy-handed)?