refactor: tooltip setting logic for clarity

[raluvy95]

Some apps such as Vesktop are still being shown as "Unknown"

[raluvy95]

As for "ghost tray" (e.g not found image, no name AND no action)
I analyzed what went wrong.

I printed out what's inside tooltip variable

SystemTrayItemToolTip(icon_name=None, icon_pixmap=None, title=None, description=None)
SystemTrayItemToolTip(icon_name='', icon_pixmap=None, title='Vesktop', description='')
SystemTrayItemToolTip(icon_name='', icon_pixmap=None, title='Telegram Desktop', description='')

I think it's pretty clear that the first one shouldn't be added in the first place? I still haven't figured out how do you implement this. Waybar and others don't show that.

I can add another checker to not show the tray icon with None params