If the todo list generated by `--make-script` is empty,
complete_action() writes a noop, but if it has only commented-out
commands, it will abort with the message "Nothing to do", and does not
launch the editor.  This adds a new test to ensure that
complete_action() behaves this way.

Signed-off-by: Alban Gruin <alban.gr...@gmail.com>
---
No changes since v5.

 t/t3404-rebase-interactive.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 01616901bd..496d88d7d6 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -75,6 +75,16 @@ test_expect_success 'rebase --keep-empty' '
        test_line_count = 6 actual
 '
 
+cat > expect <<EOF
+Nothing to do
+EOF
+
+test_expect_success 'rebase -i with empty HEAD' '
+       set_fake_editor &&
+       test_must_fail env FAKE_LINES="1 exec_true" git rebase -i HEAD^ >actual 
2>&1 &&
+       test_i18ncmp expect actual
+'
+
 test_expect_success 'rebase -i with the exec command' '
        git checkout master &&
        (
-- 
2.18.0

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