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[merge] bzr.dev 1984

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            return None
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        if history is None:
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            history = self.revision_history()
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        elif revno <= 0 or revno > len(history):
 
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        if revno <= 0 or revno > len(history):
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            raise bzrlib.errors.NoSuchRevision(self, revno)
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        return history[revno - 1]
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