fix(s3): fix panic in Stat() call

	return d.newWriter(key, *mpUpload.UploadId, allParts), nil

}

var errUnusableHeadObjectResponse = errors.New("HeadObject returned unusable response")

func (d *driver) statHead(ctx context.Context, path string) (*storagedriver.FileInfoFields, error) {

	// NOTE(prozlach): This is to cover for the cases when the rootDirectory of

	// the driver is either "" or "/".

	if err != nil {

		return nil, err

	}

	// Some S3 implementations return an empty response for certain keys.

	// The sentinal error signals the caller to retry with a ListBucket.

	if resp.ContentLength == nil && resp.LastModified == nil {

		return nil, errUnusableHeadObjectResponse

	}

	return &storagedriver.FileInfoFields{

		Path:    path,

		IsDir:   false,

		// error if querying a key which doesn't exist or a key which has

		// nested keys and Forbidden if IAM/ACL permissions do not allow Head

		// but allow List.

		if errors.As(err, new(smithy.APIError)) {

		//

		// If the response is unusable (due to bugs in alternative S3

		// implementations), we also fail over to ListObjects.

		if errors.As(err, new(smithy.APIError)) || errors.Is(err, errUnusableHeadObjectResponse) {

			fi, err := d.statList(ctx, path)

			if err != nil {

				return nil, parseError(path, err)