Exporting YOLO-OBB's label text is blank

**Describe the bug**
I used the Semantic Segmentation with Masks template for the labeling task. When exporting, I chose to export to YOLO-OBB format. After downloading the zip, the rest of the files had content, but each txt in the label folder was empty.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'my project'
2. Click on 'Exprot'
3. Choose 'YOLO-OBB' or 'YOLO-OBB with images'
4. Download the zip
5. Check the txt file in the label folder, it is empty

**Expected behavior**
I want to have a txt tag export function that conforms to the format.

**Screenshots**
Here are some of my screenshots.






**Environment (please complete the following information):**
- OS: CentOS7.6
- Label Studio Version 1.19.0

**Additional context**
In addition, to facilitate installation, I changed 'from sqlite3 import dbapi2 as Database' to 'from pysqlite3 import dbapi2 as Database' in base.py of /python3.11/site-packages/django/db/backends/sqlite3