Error thrown when deleting child permission after parent deletion

[hlayisanimazuze]

When a parent permission is deleted before its child permission, attempting to delete the child permission results in an error being thrown on the UI

Steps to reproduce the behavior:

1. Go to 'https://function-adminportal-test.shesha.dev/dynamic/Shesha/permission-configurator'
2. Click on 'Create root'
3. Enter the required information and save
4. Afterwards, create a child permission related to the permission created
5. After child permission created, click on the root parent permission and click on 'delete'
6. Actual Results: The permission should be deleted and the child permission won't show
7. Refresh the page
8. Actual Results: The child permission shows
9. Click the child permission and click on delete
10. Actual Results: Cannot read properties of null(reading is DbPermission) and when you refresh it will be removed

Expected behavior The child permission should be deleted successfully without throwing an error