gst/asfdemux/gstasfdemux.*: Improve metadata display, e.g. if the metadata comes...

gst/asfdemux/gstasfdemux.*: Improve metadata display, e.g. if the metadata comes before the streams are loaded (which...

Original commit message from CVS:
* gst/asfdemux/gstasfdemux.c: (gst_asf_demux_init),
(gst_asf_demux_commit_taglist), (gst_asf_demux_process_comment),
(gst_asf_demux_process_ext_content_desc),
(gst_asf_demux_change_state), (gst_asf_demux_add_audio_stream),
(gst_asf_demux_add_video_stream), (gst_asf_demux_setup_pad):
* gst/asfdemux/gstasfdemux.h:
Improve metadata display, e.g. if the metadata comes before the
streams are loaded (which is perfectly valid).