question.migrated.to_site null

Question

http://api.stackoverflow.com/1.0/questions/322108?sort=activity&order=desc

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      "tags": [
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      "answer_count": 0,
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      "closed_date": 1251308956,
      "closed_reason": "belongs on meta",
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      "question_id": 322108,
      "locked_date": 1251308959,
      "owner": {
        "user_id": 23234,
        "user_type": "registered",
        "display_name": "Jeff Yates",
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      "title": "Are Shakespeare's monkeys here?"
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Answer 1

This was probably related to /sites acting up yesterday, can't reproduce today.