LP#820409 fix org unit admin UI

LP#820409 fix org unit admin UI

This reverts part of 17e659eec3e23caf5d301b33aa5019b672ecd0e8, which was
tightening checks against null and '' to avoid implicit type-casting.

This line var modified_ou = new aou().fromStoreItem( current_ou ); was
producing a fieldmapper object where certain fields were being set to
contain the string "undefined" rather than a null.

The update method would take isdeleted == "undefined" as True.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>