Nautilus crashes when entering an empty string in the location bar and pressing enter.

> #0  nautilus_file_invalidate_attributes (file=0x0, file_attributes=2047) at nautilus-file.c:6407
> #1  0x0000000000459324 in begin_location_change (window=0x1948390, location=0x7f4f481a8410, new_selection=0x0, type=NAUTILUS_LOCATION_CHANGE_STANDARD,
>     distance=<value optimized out>, scroll_pos=0x0) at nautilus-window-manage-views.c:776
> #2  0x0000000000444fb2 in navigation_bar_location_changed_callback (widget=<value optimized out>, uri=<value optimized out>, window=0x1948390) at nautilus-navigation-window.c:481
> #3  0x00007f4f56ceeb5f in IA__g_closure_invoke (closure=0x1941c40, return_value=0x0, n_param_values=2, param_values=0x7fff62b606d0, invocation_hint=0x7fff62b605b0)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gclosure.c:490
> #4  0x00007f4f56d025ec in signal_emit_unlocked_R (node=0x1979c90, detail=0, instance=0x1e8c9c0, emission_return=0x0, instance_and_params=0x7fff62b606d0)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2440
> #5  0x00007f4f56d04005 in IA__g_signal_emit_valist (instance=0x1e8c9c0, signal_id=<value optimized out>, detail=0, var_args=0x7fff62b60950)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2199
> #6  0x00007f4f56d043b3 in IA__g_signal_emit (instance=0x0, signal_id=2047, detail=28933056) at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2243
> #7  0x0000000000441148 in nautilus_navigation_bar_location_changed (bar=0x1e8c9c0) at nautilus-navigation-bar.c:166
> #8  0x00007f4f56ceeb5f in IA__g_closure_invoke (closure=0x1b7a4c0, return_value=0x7fff62b60e50, n_param_values=1, param_values=0x1b98180, invocation_hint=0x7fff62b60c40)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gclosure.c:490
> #9  0x00007f4f56d025ec in signal_emit_unlocked_R (node=0x197f1b0, detail=0, instance=0x1bb8330, emission_return=0x7fff62b60e50, instance_and_params=0x1b98180)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2440
> #10 0x00007f4f56d0450c in IA__g_signal_emitv (instance_and_params=0x1b98180, signal_id=<value optimized out>, detail=0, return_value=0x7fff62b60e50)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2111
> #11 0x00007f4f581d246d in gtk_binding_entry_activate (entry=0x1981080, object=0x1bb8330) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkbindings.c:536
> #12 0x00007f4f581d2931 in binding_match_activate (pspec_list=<value optimized out>, object=0x1bb8330, path_length=8, path=0x193c000 "GtkEntry",
>     path_reversed=0x1bc4fb0 "yrtnEktG", unbound=0x7fff62b60f20) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkbindings.c:1100
> #13 0x00007f4f581d2b08 in gtk_bindings_activate_list (object=0x1bb8330, entries=<value optimized out>, is_release=<value optimized out>)
>     at /build/buildd/gtk+2.0-2.12.9/gtk/gtkbindings.c:1244
> #14 0x00007f4f581d2cfb in IA__gtk_bindings_activate_event (object=0x1bb8330, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkbindings.c:1338
> #15 0x00007f4f5822bd2f in gtk_entry_key_press (widget=0x1bb8330, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkentry.c:2066
> #16 0x00000000004abd93 in nautilus_entry_key_press (widget=0x1bb8330, event=0x1eb1f10) at nautilus-entry.c:143
> #17 0x00007f4f582a04df in _gtk_marshal_BOOLEAN__BOXED (closure=0x18d7830, return_value=0x7fff62b61270, n_param_values=<value optimized out>, param_values=0x7fff62b61350,
>     invocation_hint=<value optimized out>, marshal_data=0x4abce0) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkmarshalers.c:84
> #18 0x00007f4f56ceec2c in IA__g_closure_invoke (closure=0x18d7830, return_value=0x7fff62b61270, n_param_values=2, param_values=0x7fff62b61350, invocation_hint=0x7fff62b61230)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gclosure.c:490
> #19 0x00007f4f56d029d8 in signal_emit_unlocked_R (node=0x18d78a0, detail=0, instance=0x1bb8330, emission_return=0x7fff62b61570, instance_and_params=0x7fff62b61350)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2478
> #20 0x00007f4f56d03d16 in IA__g_signal_emit_valist (instance=0x1bb8330, signal_id=<value optimized out>, detail=0, var_args=0x7fff62b615d0)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2209
> #21 0x00007f4f56d043b3 in IA__g_signal_emit (instance=0x0, signal_id=2047, detail=28933056) at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2243
> #22 0x00007f4f583a78f5 in gtk_widget_event_internal (widget=0x1bb8330, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkwidget.c:4678
> #23 0x00007f4f583b718d in IA__gtk_window_propagate_key_event (window=0x1948390, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkwindow.c:4936
> #24 0x00007f4f583ba02b in gtk_window_key_press_event (widget=0x1948390, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkwindow.c:4966
> #25 0x00007f4f582a04df in _gtk_marshal_BOOLEAN__BOXED (closure=0x18d7830, return_value=0x7fff62b619a0, n_param_values=<value optimized out>, param_values=0x7fff62b61a80,
>     invocation_hint=<value optimized out>, marshal_data=0x444030) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkmarshalers.c:84
> #26 0x00007f4f56ceeb5f in IA__g_closure_invoke (closure=0x18d7830, return_value=0x7fff62b619a0, n_param_values=2, param_values=0x7fff62b61a80, invocation_hint=0x7fff62b61960)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gclosure.c:490
> #27 0x00007f4f56d029d8 in signal_emit_unlocked_R (node=0x18d78a0, detail=0, instance=0x1948390, emission_return=0x7fff62b61ca0, instance_and_params=0x7fff62b61a80)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2478
> #28 0x00007f4f56d03d16 in IA__g_signal_emit_valist (instance=0x1948390, signal_id=<value optimized out>, detail=0, var_args=0x7fff62b61d00)
>     at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2209
> #29 0x00007f4f56d043b3 in IA__g_signal_emit (instance=0x0, signal_id=2047, detail=28933056) at /tmp/buildd/glib2.0-2.16.3/gobject/gsignal.c:2243
> #30 0x00007f4f583a78f5 in gtk_widget_event_internal (widget=0x1948390, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkwidget.c:4678
> #31 0x00007f4f582998ad in IA__gtk_propagate_event (widget=0x1948390, event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkmain.c:2310
> #32 0x00007f4f5829a795 in IA__gtk_main_do_event (event=0x1eb1f10) at /build/buildd/gtk+2.0-2.12.9/gtk/gtkmain.c:1556
> #33 0x00007f4f57f0714c in gdk_event_dispatch (source=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>)
>     at /build/buildd/gtk+2.0-2.12.9/gdk/x11/gdkevents-x11.c:2351
> #34 0x00007f4f568590f2 in IA__g_main_context_dispatch (context=0x1822ff0) at /tmp/buildd/glib2.0-2.16.3/glib/gmain.c:2009
> #35 0x00007f4f5685c396 in g_main_context_iterate (context=0x1822ff0, block=1, dispatch=1, self=<value optimized out>) at /tmp/buildd/glib2.0-2.16.3/glib/gmain.c:2642
> #36 0x00007f4f5685c657 in IA__g_main_loop_run (loop=0x1819c80) at /tmp/buildd/glib2.0-2.16.3/glib/gmain.c:2850
> #37 0x00007f4f5829ab63 in IA__gtk_main () at /build/buildd/gtk+2.0-2.12.9/gtk/gtkmain.c:1163
> #38 0x0000000000440606 in main (argc=<value optimized out>, argv=0x7fff62b62598) at nautilus-main.c:569
> #39 0x00007f4f557551c4 in __libc_start_main () from /lib/libc.so.6
> #40 0x000000000042d879 in _start ()