Merge branch 'lf/bundle-with-tip-wo-message'

"git bundle" did not like a bundle created using a commit without
any message as its one of the prerequistes.

* lf/bundle-with-tip-wo-message:
  bundle: Accept prerequisites without commit messages

bundle.c

@@ -57,7 +57,7 @@ static int parse_bundle_header(int fd, struct bundle_header *header,
 		 * followed by SP and subject line.
 		 */
 		if (get_sha1_hex(buf.buf, sha1) ||
-		    (40 <= buf.len && !isspace(buf.buf[40])) ||
+		    (buf.len > 40 && !isspace(buf.buf[40])) ||
 		    (!is_prereq && buf.len <= 40)) {
 			if (report_path)
 				error(_("unrecognized header: %s%s (%d)"),

t/t5704-bundle.sh

@@ -58,4 +58,14 @@ test_expect_success 'ridiculously long subject in boundary' '
 	grep "^-[0-9a-f]\\{40\\} " boundary
 '
 
+test_expect_success 'prerequisites with an empty commit message' '
+	: >file1 &&
+	git add file1 &&
+	test_tick &&
+	git commit --allow-empty-message -m "" &&
+	test_commit file2 &&
+	git bundle create bundle HEAD^.. &&
+	git bundle verify bundle
+'
+
 test_done