Deserialize offset of TreeCursor only when it is not empty #11465
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Summary: It happened in one of my testing workflow run that deserialization of dataset_cursor failed. The reason it fails is due to the offset vector is serialized only when it's non-empty, but deserialization always process offset_blob whenever it is called. Though I'm still checking the reason why the offset of dataset_cursor is empty, I think it's good to remove this discrepancy.
Differential Revision: D9737636