Fix inotify unit tests on BSD based systems

lib/tfw/components/inotify/test_inotify.py

@@ -7,6 +7,7 @@ from shutil import rmtree
 from os.path import join
 from os import mkdir, remove, rename
 from tempfile import TemporaryDirectory
+from contextlib import suppress
 
 import watchdog
 import pytest
@@ -18,7 +19,8 @@ from .inotify import (
     InotifyDirMovedEvent, InotifyDirDeletedEvent
 )
 
-watchdog.observers.inotify_buffer.InotifyBuffer.delay = 0
+with suppress(AttributeError):
+    watchdog.observers.inotify_buffer.InotifyBuffer.delay = 0
 
 
 class InotifyContext: