formData is not parser if not file is uploaded

Hi im having this problem with my nextjs app.
I have an api route thas use the multer middleware, for that to work i have to tell next to disable the bodyparser for that route.
In the fronted the from has a field for a file and other text fields.
If i upload a file then i get all the data, the file and the text fields in the req.body.
But if i dont upload a file then the text fields are not populated.

` uploadRoute('imageFile', async (req, res) => {`
` console.info('REQ', req);`

and that uploadRoute middleware im using is here:
```
import multer from 'multer';
const uploader = multer();

export default (fieldName, handler) => {
// manejar cuando no se usa fieldName
if (typeof fieldName !== 'string') {
handler = fieldName;
fieldName = 'files';
}
const uploadStrategy = uploader.array(fieldName);
return (req, res) => {
uploadStrategy(req, res, () => handler(req, res));
};
};

```

Start by reproducing the shown uploadRoute middleware with a multipart form containing text fields, first with a file and then without one. Compare req.body in both cases and trace multer's array middleware behavior; done means text fields are populated consistently when no file is uploaded.

Written by the indexing model from the issue text.