[Bug 752362] taglist: update merge logic when one of the input is empty

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752362

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307394
  --> https://bugzilla.gnome.org/attachment.cgi?id=307394&action=edit
update tests for merge logic

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