Merge branch 'jk/empty-archive' into maint

"git archive" reports a failure when asked to create an archive out
of an empty tree.  It would be more intuitive to give an empty
archive back in such a case.

* jk/empty-archive:
  archive: handle commits with an empty tree
  test-lib: factor out $GIT_UNZIP setup

1 files changed, 1 insertions, 1 deletions

diff --git a/archive.c b/archive.c
index 93e00bb4ae..d254fa5d5c 100644
--- a/archive.c
+++ b/archive.c
@@ -234,7 +234,7 @@ static void parse_pathspec_arg(const char **pathspec,
 	ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 	if (pathspec) {
 		while (*pathspec) {
-			if (!path_exists(ar_args->tree, *pathspec))
+			if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 				die("path not found: %s", *pathspec);
 			pathspec++;
 		}