Revert "dlc length가 0이면 에러를 띄우던 문제를 해결"

This reverts commit b3e4ebd.

Author: HyeokjinKang

src/index.ts

@@ -859,6 +859,18 @@ app.get("/store/DLCs", async (req, res) => {
     "songs",
     "sale"
   );
+  if (!results.length) {
+    res
+      .status(400)
+      .json(
+        createErrorResponse(
+          "failed",
+          "Failed to Load",
+          "Failed to load DLC data."
+        )
+      );
+    return;
+  }
   res.status(200).json({ result: "success", data: results });
 });