Fix test for None error_args.

issue3338
review1029002
(transplanted from 073147d17dc49d250f617025eb251951f214f7d0)

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extra : transplant_source : %071G%D1%7D%C4%9D%25%0Fap%25%EB%25%19Q%F2%14%F7%D0
Reference field should contain model in EvalEnvironment

review1101002
(transplanted from bae54d7a20909a69c468f5520cdac47a6a3b00ab)

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extra : transplant_source : %BA%E5Mz%20%90%9Ai%C4h%F5R%0C%DA%C4zj%3B%00%AB