Missing origin url in 2023-09-07 dataset

use anyhow::{Context, Result};
use bitvec::prelude::*;
use dsi_progress_logger::ProgressLogger;
use log::{debug, info};
use std::collections::VecDeque;
use std::path::PathBuf;
use swh_graph::graph::*;
use swh_graph::java_compat::mph::gov::GOVMPH;

const BASENAME: &str = "/dev/shm/vlorentz/default/graph";
// const BASENAME: &str = "/home/zack/graph/2022-12-07/compressed/graph";

pub fn main() -> Result<()> {
    // Setup a stderr logger because ProgressLogger uses the `log` crate
    // to printout
    stderrlog::new()
        .verbosity(3)
        .timestamp(stderrlog::Timestamp::Second)
        .init()
        .unwrap();

    let graph = load_unidirectional(PathBuf::from(BASENAME))
        .context("Could not load graph")?
        .init_properties()
        .load_properties(|properties| properties.load_maps::<GOVMPH>())
        .context("Could not load maps properties")?
        .load_properties(|properties| properties.load_strings())
        .context("Could not load strings properties")?;

    let swhid = "swh:1:ori:3876059a87b12ed0bfec1f3f7fb684a9e1287547";
    info!("looking up SWHID {swhid} ...");
    let node_id = graph.properties().node_id(swhid).expect("Unknown SWHID");
    info!("obtained node ID {node_id} ...");

    let url = graph.properties().message_base64(node_id).expect("no message");
    info!("obtained URL {url:?}");

    Ok(())
}

errors with:

2024-01-24T10:46:38+00:00 - INFO - looking up SWHID swh:1:ori:3876059a87b12ed0bfec1f3f7fb684a9e1287547 ...
2024-01-24T10:46:38+00:00 - INFO - obtained node ID 29126529879 ...
thread 'main' panicked at rust/examples/origin.rs:40:58:
no message```