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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 752362
           Summary: taglist: update merge logic when one of the input is
                    empty
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When tag_list_merge is called with either of the input lists empty, right now,
a new empty list is being created and on top of that the other list is being
merged.
But if one of the input is empty, it is supposed to just create a copy of the
other as the merged list.

This was added to handle GST_TAG_MERGE_KEEP_ALL and GST_TAG_MERGE_REPLACE_ALL
mode during merging.
But these modes should be valid only when both the inputs are not NULL. It
doesn't make sense to create a new empty list, just to handle these two modes,
even though NULL is being passed as input.

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