perf: don't dump json on break

sdgb-cli/src/main.rs

@@ -195,12 +195,16 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
             #[cfg(feature = "cache")]
             let _ = write.commit();
 
+            if !EARLY_QUIT.load(Ordering::Relaxed) {
                 let output = OpenOptions::new()
                     .write(true)
                     .truncate(true)
                     .create(true)
                     .open("players.json")?;
                 serde_json::to_writer_pretty(output, &players)?;
+            } else {
+                info!("current progress: {}", players.len());
+            }
         }
         commands::Commands::Userdata { user_id } => {
             let action = async |_| match Sdgb1_50::request::<_, GetUserDataApiResp>(