"error while sending message ( recipient-unavailable )" randomly shows up in chat window
The message "error while sending message ( recipient-unavailable )" randomly shows up in chat windows sometimes. This also happened when I didn't send any message to that contact recently, so I have no idea what's actually causing the problem here. Even when starting gajim on the console, no error is logged there.
The particularly annoying aspect of this bug is that this message causes a "new message" notification, the window gets highlighted and the tray icon blinks.
I guess what I'm mostly asking about right now is to make the error message more informative.
Steps to reproduce
OS version: Debian testing
GTK version: 2.24.29
PyGTK version: 2.24.0