Merge pull request git-for-windows#797 from glhez/master

`git bundle create <bundle>` leaks handle the revlist is empty.

Author: dscho

bundle.c

@@ -457,10 +457,11 @@ int create_bundle(struct bundle_header *header, const char *path,
 	object_array_remove_duplicates(&revs.pending);
 
 	ref_count = write_bundle_refs(bundle_fd, &revs);
-	if (!ref_count)
-		die(_("Refusing to create empty bundle."));
-	else if (ref_count < 0)
+	if (ref_count <= 0)  {
+		if (!ref_count)
+			error(_("Refusing to create empty bundle."));
 		goto err;
+	}
 
 	/* write pack */
 	if (write_pack_data(bundle_fd, &revs)) {

t/t5607-clone-bundle.sh

@@ -71,4 +71,8 @@ test_expect_success 'prerequisites with an empty commit message' '
 	git bundle verify bundle
 '
 
+test_expect_success 'try to create a bundle with empty ref count' '
+	test_expect_code 1 git bundle create foobar.bundle master..master
+'
+
 test_done