djcb/mu — pull request #445 by thierryvolpiatto (2014-06-18 13:49:31+00:00)
Title: Kill composition buffer when quitting from reply prompt

After hitting R (reply) we are asked (maybe) to reply to all, sender or C-g to cancel.
When hitting C-g we end up with an empty buffer we have to kill afterward.
This patch allow killing the composition buffer in such case.