14dfef9535
This fixes a case where null was being passed to prefixLines, which also obviates the need for prefixLines to explicitly check for null. R=amouravski@google.com Review URL: https://codereview.chromium.org//15143002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@22648 260f80e4-7a28-3924-810f-c04153c831b5