proper drafts (not scheduled) mails throw errors

[bennyandresen]

Text by Ben Maughen: " I may have found a small bug. If I save a message as a draft and then send a message with delay so that it also ends up in my drafts folder waiting to be sent, then the timer fails with the following:

Error running timer `mu4e-send-delay-send-queue': (wrong-type-argument integerp nil)

and the delayed message is not sent until I delete or send the draft message. "