tests/test-diff-newlines

Fix up parent display in logging

For changesets with a first parent nullid, but not rev 0, we ought to
display a null parent.

#!/bin/sh

hg init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1