ms_ews_util_pkg.get_item always returns NULL for item_id and change_key

[eaolson]

In ms_ews_util_pkg, the get_item function returns a record with the item_id and change_key elements always NULL, even when it successfully retrieves an email. The find_items_as_list function correctly populates these in its array, though.

It has to do with how the XML result is being parsed. I should have a fix shortly.