Deleting the last terminal of a port, deletes the port itself as well

[gkorompi]

Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

Deleting the last terminal of a port, deletes also the parent port from app.boundaries

Steps To Reproduce

Which Operating System are you using?

Windows

Which Python version are you using?

3.10

Installed packages