[PATCH 2/2] t5704: Test prerequisites with empty commit messages

While stating that commit messages of prerequisites are optional in
bundles, we used to disallow prerequisite lines consisting of an object
name only. This behavior made `git bundle verify` and `git bundle
unbundle` reject bundles that contain prerequisites without any commit
message.

Add a test to reproduce this behavior.

Signed-off-by: Lukas Fleischer <redacted>
---
 t/t5704-bundle.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/t/t5704-bundle.sh b/t/t5704-bundle.sh
index 9e43731..a45c316 100755
--- a/t/t5704-bundle.sh
+++ b/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

-- 
1.8.2.675.gda3bb24.dirty