Some requests to piston fail.

[Jonxslays]

Error:
Err(reqwest::Error { kind: Decode, source: Error("invalid type: null, expected isize", line: 1, column: 10132) })

Only happens on certain requests.

Reproduction code:

use piston_rs;

#[tokio::main]
async fn main() {
    let client = piston_rs::Client::new();
    let file = piston_rs::File::default()
        .set_content("for i in range(10_000):\n\tprint(i)");

    let executor = piston_rs::Executor::new()
        .set_language("python")
        .add_file(file);

    match client.execute(&executor).await {
        Ok(response) => {
            if let Some(c) = response.compile {
                println!("Compilation:\n\n{}", c.output);
            }

            println!("Output:\n\n{}", response.run.output);
        }
        Err(e) => {
            println!("Something went wrong contacting Piston.");
            println!("{}", e);
        }
    }
}