Fix handling of exceptions in try_cast from Json #6116
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Summary: try_cast from Json to complex types used to throw when there are exceptions during casting from the first row. The reason is that in this situation, castFromJson() calls add_item() of the top-level complex-type writer before its child generic writer is casted. VectorWriter<Generic> doesn't allow this use case before this fix.
Differential Revision: D48370227