ui: keep working if pyinotify fails loading

pyinotify has stopped working in python3.12, it fails loading with the
error:
ModuleNotFoundError: No module named 'asyncore'

For now, ignore this error and keep working as usual.
Applications icons will be loaded on GUI startup, but we loose the
ability of discovering the icons of applications while the GUI is
running.

Closes: #1132

ui/opensnitch/desktop_parser.py

@@ -1,12 +1,18 @@
 from threading import Lock
 import configparser
-import pyinotify
 import threading
 import glob
 import os
 import re
 import locale
 
+is_pyinotify_available = True
+try:
+    import pyinotify
+except Exception as e:
+    is_pyinotify_available = False
+    print("Error importing pyinotify:", e)
+
 DESKTOP_PATHS = tuple([
     os.path.join(d, 'applications')
     for d in os.getenv('XDG_DATA_DIRS', '/usr/share/').split(':')
@@ -36,7 +42,8 @@ def __init__(self):
             for desktop_file in glob.glob(os.path.join(desktop_path, '*.desktop')):
                 self._parse_desktop_file(desktop_file)
 
-        self.start()
+        if is_pyinotify_available:
+            self.start()
 
     def get_locale(self):
         try: