message: Change logging level to WARN and format.
diff: @@ -668,7 +668,10 @@ impl<I: NodeIdT, C: Context + 'static> HighwayProtocol<I, C> {
  let ev = match state.maybe_evidence(vid) {
  Some(ev) => ev.clone(),
  None => {
  - error!(?vid, instance_id=?self.highway.instance_id(), "panorama marked validator as faulty but no evidence was found");
  + warn!(
  + ?vid, instance_id=?self.highway.instance_id(),
  + "panorama marked validator as faulty but no evidence was found"
  + );
  return vec![];
  }
  };
  