I have this same question about how to recover a draft message that now displays "this message has no content" and I am updated on my Iphone to IOS 9.1
I have a very lengthy draft that I am desperate to recover but there does not seem to be a way to move a folder in draft to another folder
pressing the new message icon to bring up the message, results in opening the draft message as a blank
I know it must have something to do with the server and how things change status if you have read them, but I don't know what to do to fix this
thanks
ML