magit/magit — pull request #1052 by shigi (2013-11-19 12:45:17+00:00)
Title: magit-wash-hunk: fix argument of magit-diff-refine-hunk

In magit-wash-hunk, magit-diff-refine-hunk seems to be called
invalid argument. So error occurs when variable magit-diff-refine-hunk
is set not nil.