Bug 2404

Steps to reproduce:
1. Start galeon in the background with \"galeon -s\".
2. Open a galeon window and visit some webpage.
3. Close the window.
4. Exit the GNOME session.

At this point, a crash dialog occurs.
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Traceback:

#0  0x40aea4fd in g_list_copy () from /usr/lib/libglib-2.0.so.0
#1  0x080a0fa2 in session_close (session=0x8216268) at session.c:399
#2  0x080a0e7b in session_die_cb (client=0x8176ee8, session=0x8216268) at session.c:349
#3  0x40aaad87 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#4  0x40a97ee7 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#5  0x40aaa993 in g_signal_emit_by_name () from /usr/lib/libgobject-2.0.so.0
#6  0x40aa99b8 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#7  0x40aa9bf4 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#8  0x40293bcb in gnome_window_icon_init () from /usr/lib/libgnomeui-2.so.0
#9  0x402da4f2 in _SmcProcessMessage () from /usr/X11R6/lib/libSM.so.6
#10 0x402e6a27 in IceProcessMessages () from /usr/X11R6/lib/libICE.so.6
#11 0x4026c265 in gnome_href_set_label () from /usr/lib/libgnomeui-2.so.0
#12 0x40b0df1f in g_vsnprintf () from /usr/lib/libglib-2.0.so.0
#13 0x40aecbf5 in g_get_current_time () from /usr/lib/libglib-2.0.so.0
#14 0x40aedc38 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#15 0x40aedf4d in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x40aee64f in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#17 0x407832e8 in bonobo_main () from /usr/lib/libbonobo-2.so.0
#18 0x0808ee1f in main (argc=2, argv=0xbffff834) at galeon-main.c:158