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elif self._last_revision == NULL_REVISION:
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# fetch_spec is None + last_revision is null => empty fetch.
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# explicit limit of no revisions needed
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elif self._last_revision is not None:
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self.from_repository, [self._last_revision],
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find_ghosts=self.find_ghosts).execute()
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else: # self._last_revision is None:
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find_ghosts=self.find_ghosts).execute()