git svn: fix empty directory creation Avoid attempts to stat() the contents of '', which could happen when the root directory is empty. Additionally, remove the unnecessary '_' stat optimization since it was confusing and possibly throwing off the non-existent case. [ew: fixed indentation, rewrote commit message] Acked-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Michael J. Kiwala <mkiwala@genome.wustl.edu>