Comment 19 for bug 1774268

Looking into this today things have been complicated by bug 1570072 which allows staff or patrons to update existing holds when these values change. for <3.5 it can be as simple as changing the condition in Suzanne's branch from "if (!notify)" to "if (!notify && !(notify === ''))" to combine her and Jeff's approaches, but for 3.5+ it needs to do a little more than just nope out. I'll see if I can throw some tuits at it.