Fix handling no newline at EOF in both files

If both files have no newline at EOF, diff will notify us in the
context, but that case wasn't handled by the parser.

https://storyboard.openstack.org/#!/story/84

Change-Id: Ib2f1b4b4c9d8f38a983300e7026331754592705f
Merge "Fix handling no newline at EOF in both files"