message: [safety-rules] improve error logging on reading waypoints
  Closes:
  Approved by: mgorven
diff: @@ -102,6 +102,7 @@ impl PersistentSafetyStorage {
  .get(WAYPOINT)
  .and_then(|r| r.value.string())?;
  Waypoint::from_str(&waypoint)
  + .map_err(|e| anyhow::anyhow!("Unable to parse waypoint: {}", e))
  }
  pub fn set_waypoint(&mut self, waypoint: &Waypoint) -> Result<()> {
  