[giow] (3) window.name should be the empty string when the name isn't set.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=24728
Affected topics: DOM APIs

git-svn-id: http://svn.whatwg.org/webapps@8483 340c8d12-0b0e-0410-8428-c7bf67bfef74