[Bug 762349] matroskamux: generated files sometimes don't open on android

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762349

--- Comment #4 from Matej Knopp <matej.knopp at gmail.com> ---
well, the way tags are muxed in matroska is TAGS -> TAG -> bunch of
SIMPLE_TAGs. 

The issue is TAG without content (no SIMPLE_TAGs); And I'm also guessing
SIMPLE_TAG with empty string value too, I'll have to test later.

The null check after serialization is same thing
gst_matroska_mux_write_simple_tag does. I wanted it to be consistent.
gst_matroska_mux_write_simple_tag skips tags that have value that fails to
serialize, so gst_matroska_mux_tag_list_is_empty should do the same.

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