Update app.py

app.py

@@ -23,8 +23,9 @@ class OnnxModelConverter:
         
     def download_file(self,file_path):
          if not os.path.exists(file_path):
-            with open(file_path, "w") as file:
-                file.write("This is a test ONNX model.")
+            #with open(file_path, "w") as file:
+                #file.write("This is a test ONNX model.")
+            return None
          return file_path