/// ) {
/// // Read a serialized channel monitor paired with the block hash when it was persisted.
/// let serialized_monitor = "...";
-/// let (monitor_block_hash, mut monitor) = <(BlockHash, ChannelMonitor<S>)>::read(
+/// let (monitor_block_hash_option, mut monitor) = <(Option<BlockHash>, ChannelMonitor<S>)>::read(
/// &mut Cursor::new(&serialized_monitor), keys_manager).unwrap();
///
/// // Read the channel manager paired with the block hash when it was persisted.
/// // Synchronize any channel monitors and the channel manager to be on the best block.
/// let mut cache = UnboundedCache::new();
/// let mut monitor_listener = (monitor, &*tx_broadcaster, &*fee_estimator, &*logger);
-/// let mut listeners = vec![
-/// (monitor_block_hash, &mut monitor_listener as &mut dyn chain::Listen),
-/// ];
+/// let mut listeners = vec![];
+/// if let Some(monitor_block_hash) = monitor_block_hash_option {
+/// listeners.push((monitor_block_hash, &mut monitor_listener as &mut dyn chain::Listen))
+/// }
/// if let Some(manager_block_hash) = manager_block_hash_option {
/// listeners.push((manager_block_hash, &mut manager as &mut dyn chain::Listen))
/// }