/Python/, in <genexpr> if not all (key in json for key in transaction_keys): TypeError: argument of type 'NoneType' is not iterable
, in <genexpr> if not all (key in json for key in transaction_keys): TypeError: argument of type 'NoneType' is not iterable
, in if not all (key in json for key in transaction_keys): TypeError: argument of type 'NoneType' is not iterable 
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