BadWindow error crashes Python script

**Description**
When using a Visualizer object to call create_window(), closing it and calling create_window() again, the Python script crashes with the following error:

```
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 18 (X_ChangeProperty)
Resource id in failed request: 0x0
Serial number of failed request: 244
Current serial number in output stream: 251
```
This may be related to #1715, due to the similarity in the steps to reproduce the issue. However, the error message is slightly different.

**To Reproduce**
Steps to reproduce the behavior:

```
import open3d as o3d

vis = o3d.visualization.Visualizer()
vis.create_window()
vis.run()
vis.destroy_window()
vis.create_window() # This is the line the error occurs
vis.run()
vis.destroy_window()
vis.destroy()
```

**Environment:**

- Operating system: Ubuntu 20.10
- Python version: Python 3.8.6
- Open3D version: 0.12.0
- Is this remote workstation?: no
- How did you install Open3D?: pip