Zain authored Nov 08, 2015 and Kai Willadsen committed Nov 14, 2015

Problem:
  When meld is launched from console, usecase is git difftool,
  After closing App using Alt+F4 console displays multiple error messages
  Error Messages look like
  (meld:18521): Gtk-CRITICAL **: gtk_container_foreach: assertion 'GTK_IS_CONTAINER (container)' failed

Cause:
  closing window triggers do_window_removed
  Unlike when Quit is choosen from Menu, self.quit() is never called
  Gtk complains and adds error messages on STDERR

Solution:
  When do_window_removed is called check if there are any active windows
  If there is no active window, call self.quit()