flvdemux: Don't write an empty string as a tag
To stop warnings like:
GStreamer-WARNING **: 19:47:48.186: Trying to set empty string on taglist field 'encoder'. Please file a bug.
Edited by Vivia Nikolaidou
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To stop warnings like:
GStreamer-WARNING **: 19:47:48.186: Trying to set empty string on taglist field 'encoder'. Please file a bug.