The Nazgūl en route (the one that passed over Dol Baran) was not sent as a result of Pippin looking into the stone, as G tells Pippin himself, and G is fairly explicit about the "error":
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'But it was not coming for me, was it?' faltered Pippin. 'I mean, it didn't know that I had
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'Of course not,' said Gandalf. 'It is two hundred leagues or more in straight flight from Barad-dūr to Orthanc, and even a Nazgūl would take a few hours to fly between them. But Saruman certainly looked in the Stone since the orc-raid, and more of his secret thought, I do not doubt, has been read than he intended. A messenger has been sent to find out what he is doing. And after what has happened tonight another will come, I think, and swiftly. So Saruman will come to the last pinch of the vice that he has put his hand in. He has no captive to send. He has no Stone to see with, and cannot answer the summons. Sauron will only believe that he is withholding the captive and refusing to use the Stone. It will not help Saruman to tell the truth to the messenger. For Isengard may be ruined, yet he is still safe in Orthanc. So whether he will or no, he will appear a rebel.
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As a sidebar, more evidence that calling a hobbit an "it" is not at all unusual or unprecedented may be found in the dialogue of Shagrat and Gorbag regarding Frodo:
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'Lugbśrz wants it, eh? What is it, d'you think? Elvish it looked to me, but undersized. What's the danger in a thing like that?'
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EDIT: Cross-posted with Raynor.