[Bug]: [ERROR]Internal server error while chunking: ****wxy: Failed to parse CSV and convert to Excel Workbook: No columns to parse from file

### Self Checks

- [x] I have searched for existing issues [search for existing issues](https://github.com/infiniflow/ragflow/issues), including closed ones.
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### RAGFlow workspace code commit ID

3b7608b72e51

### RAGFlow image version

v0.19.0

### Other environment information

```Markdown

```

### Actual behavior

The following error was displayed while parsing the file
[ERROR]Internal server error while chunking: ****wxy: Failed to parse CSV and convert to Excel Workbook: No columns to parse from file

### Expected behavior

_No response_

### Steps to reproduce

```Markdown
After uploading the file to the knowledge base, click on parse, and then the parsing fails
```

### Additional information

_No response_

The report provides no file, test, or entry point. Start by reproducing the failure in RAGFlow v0.19.0 at commit 3b7608b72e51, following the knowledge-base upload and parse flow that reports the CSV-to-Excel error. Done means the affected upload parses without the reported “No columns to parse from file” failure.

Written by the indexing model from the issue text.