Comment 2 for bug 941675

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7fd7e7f1b190 "remove_button_clicked", message=0x7fd80826aa40 "code should not be reached") at /build/buildd/glib2.0-2.31.18/./glib/gtestutils.c:1860
 remove_button_clicked (button=<optimized out>, panel=0x7fd80c99c010) at cc-background-panel.c:1097
 g_closure_invoke (closure=0x7fd80c9df140, return_value=0x0, n_param_values=1, param_values=0x7fd80cd11680, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.18/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=<optimized out>, emission_return=0x0, instance_and_params=0x7fd80cd11680) at /build/buildd/glib2.0-2.31.18/./gobject/gsignal.c:3302
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=0x7fff541bef58) at /build/buildd/glib2.0-2.31.18/./gobject/gsignal.c:3033