fix missing import

src/features_window.py

@@ -177,6 +177,7 @@ class FeaturesWindow:
 	def notification_available(self):
 		if os.name == 'nt':
 			return False
+		from common import dbus_support
 		if self.dbus_available() and dbus_support.get_notifications_interface():
 			return True
 		try: