Merge pull request #797 from glhez/master

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

bundle.c

@@ -447,10 +447,11 @@ 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/tgfw790-git-bundle.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+test_description='
+  test git-bundle under git for Windows
+
+    When we select an empty set of commit (like git bundle create foobar.bundle master..master),
+    we should not have problem with the foobar.bundle.lock being locked (especially on Windows).
+'
+
+. ./test-lib.sh
+
+test_expect_failure 'try to create a bundle with empty ref count' '
+	git bundle create foobar.bundle master..master
+'
+
+test_done