If a prim inventory becomes empty through deletion, send an empty xfer file name rather than one that references a metadata file containing only the folder object.

If we do this, then viewer 3 crashes when we try and rez a script directly in an attachment's prim inventory.
Sending an empty file name was already being done if the prim's inventory had never been touched.
Now we always do that if there are no items in that inventory.
Hopefully addresses the remaining point in http://opensimulator.org/mantis/view.php?id=5644

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