Added a check to return an empty string when attempting to read a file that doesn't exist

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

src/main.rs

@@ -1,4 +1,4 @@
-use std::{fs::{File, create_dir_all}, io::{Read, Write}, path::PathBuf};
+use std::{fs::{File, create_dir_all}, io::{Read, Write}, path::{Path, PathBuf}};
 
 use hyper_tls::HttpsConnector;
 use hyper::{Body, Client, body, client::HttpConnector};
@@ -32,6 +32,7 @@ fn write_to_file(d: &str, p: &str) {
 }
 
 fn read_from_file(p: &str) -> String {
+    if !Path::new(p).exists() { return "".to_string(); }
     let mut d = String::new();
     let mut ifile = File::open(p).expect("Cannot open file.");
     ifile.read_to_string(&mut d).expect("Cannot read file.");