git checkout under 1.7.6 does not properly list untracked files and aborts

[Joshua Jensen <jjensen@workspacewhiz.com>]

This may be an msysGit 1.7.6 issue, as that is what I am using.  It also 
occurs in msysGit 1.7.5, but I am almost certain it did not happen in 
msysGit 1.7.2.

Given an untracked file in the working directory that has been added to 
an alternate branch, when switching to that alternate branch, 'git 
checkout' exits with an error code but does not print anything to the 
console.  It should print an untracked file error.

I have been trying to track this down in code.  The point where the 
error messages are printed, display_error_msgs, is never hit.

I don't have a debugger to trace this on Windows, so I've just been 
adding lots of debug output.  So far, I have not found the catalyst.

I am out on vacation now for the next week and a half.  However, I 
thought I would send this along to see if someone else can confirm the 
the problem.  I'll continue investigation when I'm back.

Thanks.

Josh