🐛 fix(base.py): change condition to check if content is empty instead of None

The previous condition was checking if the content was None, but it should check if it is empty. This change fixes the error message to be more accurate.

src/backend/langflow/cache/base.py

@@ -120,7 +120,7 @@ def save_binary_file(content: str, file_name: str, accepted_types: list[str]) ->
 
     # Get the destination folder
     cache_path = Path(tempfile.gettempdir()) / PREFIX
-    if content is None:
+    if not content:
         raise ValueError("Please, reload the file in the loader.")
     data = content.split(",")[1]
     decoded_bytes = base64.b64decode(data)