list-objects.c: don't add an unparsed NULL as a pending tree

"git rev-list --first-parent --boundary $commit^..$commit" segfaults on a
merge commit since 8d2dfc4 (process_{tree,blob}: show objects without
buffering, 2009-04-10), as it tried to dereference a commit that was
discarded as UNINTERESTING without being parsed (hence lacking "tree").

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/t/t6110-rev-list-sparse.sh b/t/t6110-rev-list-sparse.sh
new file mode 100755
index 0000000000..2a267e84cd
--- /dev/null
+++ b/t/t6110-rev-list-sparse.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+test_description='operations that cull histories in unusual ways'
+. ./test-lib.sh
+
+test_commit () {
+	echo "$1" >"$1.file" &&
+	git add "$1.file" &&
+	test_tick &&
+	git commit -m "$1"
+}
+
+test_expect_success setup '
+	test_commit A &&
+	test_commit B &&
+	test_commit C &&
+	git checkout -b side HEAD^ &&
+	test_commit D &&
+	test_commit E &&
+	git merge master
+'
+
+test_expect_success 'rev-list --first-parent --boundary' '
+	git rev-list --first-parent --boundary HEAD^..
+'
+
+test_done