handle BaseWindow.hideEvent exception for non-macOS systems

[erfan-khadem]

I was experiencing the following exception on my Arch setup using GNOME 40:

15:57:14 - INFO    - normcap.app            - L:37  - Starting Normcap v0.2.5
15:57:15 - INFO    - normcap.utils          - L:178 - Searching tesseract languages 
15:57:19 - ERROR   - normcap.utils          - L:288 - Uncaught exception! Quitting NormCap!
Traceback (most recent call last):
  File "/home/erfan/.local/lib/python3.9/site-packages/normcap/gui/base_window.py", line 201, in hideEvent
    if self.macos_border_window:
AttributeError: 'MainWindow' object has no attribute 'macos_border_window'

It turns out that by just returning and doing nothing at BaseWindow.hideEvent everything goes right; so I added this exception catching clause.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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0.0% Duplication

[dynobo]

Your PR is highly appreciated, @er888kh. But I already solved this during refactoring which I committed some days ago to dev. The new release should be ready in a few days, if nothing pops up during testing.

[erfan-khadem]

But I already solved this during refactoring

That is awesome! Thank you.