Fix error in chooseNVDAObjectOverlayClasses

[CyrilleB79]

Issue

In A8M 4.1.1 with NVDA 2024.2, there are two errors in chooseNVDAObjectOverlayClasses:

Error 1: in 6pad++ editor's edit field

ERROR - NVDAObjects.__call__ (11:34:02.700) - MainThread (1600):
Exception in chooseNVDAObjectOverlayClasses for GlobalPlugin ('globalPlugins.Access8Math')
Traceback (most recent call last):
  File "NVDAObjects\__init__.pyc", line 118, in __call__
  File "C:\Users\Cyrille\AppData\Roaming\nvda\addons\Access8Math\globalPlugins\Access8Math\__init__.py", line 260, in chooseNVDAObjectOverlayClasses
    if _("Access8Math Editor") in obj.parent.parent.name or obj.appModule.appName.startswith("notepad"):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: argument of type 'NoneType' is not iterable

This error occurs because obj.parent.parent.name is None

Error 2: When locking the computer pressing windows+L

ERROR - NVDAObjects.__call__ (11:30:04.212) - MainThread (1600):
Exception in chooseNVDAObjectOverlayClasses for GlobalPlugin ('globalPlugins.Access8Math')
Traceback (most recent call last):
  File "NVDAObjects\__init__.pyc", line 118, in __call__
  File "C:\Users\Cyrille\AppData\Roaming\nvda\addons\Access8Math\globalPlugins\Access8Math\__init__.py", line 256, in chooseNVDAObjectOverlayClasses
    if obj.windowClassName == "wxWindowNR" and obj.role == ROLE_WINDOW and obj.name == _("Access8Math interaction window"):
       ^^^^^^^^^^^^^^^^^^^
AttributeError: '_SecureDesktopNVDAObject' object has no attribute 'windowClassName'

This error occurs because not all NVDAObjects have an attribute windowClassName; only the ones constructed from a real window (NVDAObjects.window.Window) which are the vast majority have.

Please remember this; I think I had already fixed such an issue in the past.

Fixes

Error 1

Also filter on TypeError in the except clause

Error 2:

Instead of obj.windowClassName, use getattr(obj, 'windowClassName', None) instead. This allows to return None when the attribute does not exist rather than raising AttributeError exception.