3463 with item added mail not sent if work belongs to a series

When a new work is added to a collection and both (a) a collection email has been provided and (b) "Send a message to the collection email when a work is added" is selected, a notification should be sent to that email address. It was erroring if the work was part of a series.

http://code.google.com/p/otwarchive/issues/detail?id=3463