Comment 2 for bug 842453

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x4246d0 "get_channel_map_for_card", message=0x1a41210 "assertion failed: (stream)") at /build/buildd/glib2.0-2.28.6/./glib/gtestutils.c:1358
 g_assertion_message_expr (domain=0x0, file=0x42418e "gvc-speaker-test.c", line=390, func=0x4246d0 "get_channel_map_for_card", expr=<optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gtestutils.c:1369
 get_channel_map_for_card (output_name=<optimized out>, card=0x17a2020, control=<optimized out>) at gvc-speaker-test.c:390
 update_channel_map (speaker_test=0x17a4280) at gvc-speaker-test.c:417
 object_set_property (nqueue=0x1a30640, value=0x19a2f88, pspec=0x18de4a0, object=0x17a4280) at /build/buildd/glib2.0-2.28.6/./gobject/gobject.c:1185