Serialization/Deserialization fails for empty node hashes

[Ash-L2L]

use rustreexo::accumulator::{node_hash::NodeHash, pollard::Pollard};

#[test]
fn test_pollard_serialization() {
    let mut p = Pollard::new();
    let values = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
    let hashes: Vec<NodeHash> = values
         .into_iter()
         .map(|i| NodeHash::from([i; 32]))
         .collect();
    p.modify(&hashes, &[]).expect("modify should work");
    p.modify(&[], &hashes).expect("modify should work");
    let mut serialized= Vec::<u8>::new();
    p.serialize(&mut serialized).expect("serialize should work");
    let _pollard = Pollard::deserialize(&*serialized).expect("deserialization fails");
}