try 2: shell32: fix SHFileOperation copying to an empty file list

[Vincent Povirk]

This partially fixex bug 13394.

Apparently there are two separate issues involved in that bug, one
with empty destination lists (which Windows seems to treat as a list
containing one 0-length string), and one involving long filenames.
This patch only addresses the empty lists.

-- 
Vincent Povirk
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