Handle a revision that only creates a new tag correctly.
Handle a revision that only creates a new tag correctly.

Fix an error when a svn revision consists only of the creation of a new tag
directory (/tags/this_is_a_tag).

Signed-off-by: Yaacov Akiba Slama <e92fc4e26a76b5e853ce3c0ef5b3f7e371ef0773@slamail.org>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git