oggmux: push eos event when empty pad data
If gst_ogg_mux_queue_pads returns NULL it means we are at EOS, because we get a NULL buffer and this function never sets bestpad. https://bugzilla.gnome.org/show_bug.cgi?id=729315
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If gst_ogg_mux_queue_pads returns NULL it means we are at EOS, because we get a NULL buffer and this function never sets bestpad. https://bugzilla.gnome.org/show_bug.cgi?id=729315