Implemented proper error handling, now we can do user.save($conn)?; and it works.

In the future, maybe we can do the same with the `find_by_id` methods that return an Option.

src/main.rs

@@ -14,9 +14,8 @@
 use std::{path::Path, process::{exit, Command}};
 use rocket::Rocket;
 
-#[macro_use]
+#[macro_use] mod error;
 mod util;
-
 mod api;
 mod db;
 mod crypto;