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旧実況からニコ生になった影響で、タイムシフトでコメントが削除されているケースがあるようです。
その場合、非公式過去ログには削除済みのchatが残っていてTvTCommentでそのchatをパースできず不正な応答となるようなので修正しました。
あと、2ch過去ログにおいて日時に秒がないデータが存在していたため考慮するように変更しました。