BUG: Wrapper component breaks when property is changed after deleting child section

### GrapesJS version

- [X] I confirm to use the latest version of GrapesJS

### GrapesJS MJML version

- [X] I confirm to use the latest version of GrapesJS MJML

### What browser are you using?

Brave Version 1.70.119 Chromium: 129.0.6668.70

### Reproducible demo link

https://grapesjs.com/demo-mjml

### Describe the bug

**How to reproduce the bug?**
1. Go to the demo mjml page https://grapesjs.com/demo-mjml
2. Drag and drop a wrapper component
3. Delete one section from within the wrapper
4. Select the wrapper and change any of its properties

**What is the expected behavior?**

The property change should be reflected without affecting the child components

**What is the current behavior?**

All the child elements inside the wrapper disappears

https://github.com/user-attachments/assets/d4e7f077-0def-4885-a986-dec2547adb48

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct