When a donor loads the RecurUpgrade form and we can't find an eligible recurring donation to upgrade (e.g. they have cancelled their recurring donation after the email goes out), we should show donors a friendly error message with a link to start a new recurring donation when they load the form.
@AMJohnson can you please add the link you usually send to donors to start a new donation?
Wording suggestions? Is this OK? "We couldn't find a recurring donation to upgrade. To start a new one, click here"