Umbraco back-office error previewing dummy.txt

This is my first github pull request - so I hope it's not a disaster!  From the package manager in Visual Studio 2012 I did a:

install-package umbracocms 

It dropped the dummy.txt file in the scripting files, but this file errors if you try to preview it in the back-office.  This is previously reported here: http://issues.umbraco.org/issue/U4-1620