write-tree: Avoid leak when index refers to an invalid object
Noticed by valgrind during test t0000.35 “writing this tree without --missing-ok”. Even in the cherry-pick foo..bar code path, such an error is the end of the line. But maybe some day an interactive porcelain will want to link to libgit, making this matter. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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