Hello,

Wed Dec 23 19:32:17 PST 2009 Tim Horton <tmhorton@gmail.com>
* X.P.Shell, filter empty string from PATH

doesDirectoryExist returns True if given an empty string using ghc <= 6.10.4.
This causes getDirectoryContents to raise an exception and X.P.Shell does not
render. This is only an issue if you have an empty string in your PATH.

Using ghc == 6.12.1, doesDirectoryExist returns False given an empty string, so
this should not be an issue in the future.

Thanks!
Tim