adjust code, support situation as describe flowing #2
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when query use with like :
where Person may( may not ) has many book. each book has a author.
the query result will be :
we can see that some people like Jim haven't a book --- the query result "undef";
this situation will trigger the code in Async::ORM::_map_row_to_object "die";
when it checking the subwith : book, but it wouldn't be set( because of the undef).
I think we should do not check the empty as an error.
when empty, means the related table's result is null.
hope you can consider it :) thanks !