Fix bug entry and quotation marks in merge-to-branch.

This fixes usage of quotation marks inside titles of merged patches.
This also fixes aggregation of empty or "none" BUG entries.

BUG=
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/223463003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20483 ce2b1a6d-e550-0410-aec6-3dcde31c8c00