remove default arg: would fail to encode None if used!

git-svn-id: https://xpra.org/svn/Xpra/trunk@17936 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/server/server_base.py

@@ -1781,7 +1781,7 @@ def control_command_send_notification(self, nid, title, message, client_uuids):
         notifylog("control_command_send_notification(%i, %s, %s, %s) will send to sources %s (matching %s)", nid, title, message, client_uuids, sources, client_uuids)
         count = 0
         for source in sources:
-            if source.notify(0, nid, "control channel", 0, "", title, message, 10):
+            if source.notify(0, nid, "control channel", 0, "", title, message, 10, ()):
                 count += 1
         msg = "notification id %i: message sent to %i clients" % (nid, count)
         notifylog(msg)

src/xpra/server/source.py

@@ -1962,7 +1962,7 @@ def bell(self, wid, device, percent, pitch, duration, bell_class, bell_id, bell_
             return
         self.send_async("bell", wid, device, percent, pitch, duration, bell_class, bell_id, bell_name)
 
-    def notify(self, dbus_id, nid, app_name, replaces_nid, app_icon, summary, body, expire_timeout, icon=None):
+    def notify(self, dbus_id, nid, app_name, replaces_nid, app_icon, summary, body, expire_timeout, icon):
         if not self.send_notifications:
             notifylog("client %s does not support notifications", self)
             return False