Return empty value if nothing is found.

src/main.rs

@@ -173,18 +173,7 @@ async fn get_progress(
         .unwrap_or_default();
 
     if values.is_empty() {
-        let res = GetProgress {
-            percentage: 0.0f32,
-            progress: String::new(),
-            device: String::new(),
-            device_id: String::new(),
-            timestamp: 0,
-            document,
-        };
-        return (
-            StatusCode::OK,
-            Json(json!({})),
-        );
+        return (StatusCode::OK, Json(json!({})));
     }
 
     let res = GetProgress {