Description:
------------
using the COPY function to copy an empty file trough FTP returns error, although the empty file is created correctly on the target.


Reproduce code:
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#!/usr/bin/php -q
<?php

var_dump(copy("ftp://<userid>:<password>@<HostIP>/<path>/emptyfile", "targetfile"));

?>

Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)