Update ocr.py

ocr.py

@@ -23,4 +23,8 @@ os.makedirs(result_dir, exist_ok=True)
 @ocr.route("/process", methods=["POST"])
 def ocr_inference():
     if "file" not in request.files:
-        return jsonify({"error": "No file provided"}), 400
\ No newline at end of file
+        return jsonify({"error": "No file provided"}), 400
+        
+    file = request.files["file"]
+    if file.filename == "":
+        return jsonify({"error": "No selected file"}), 400
\ No newline at end of file