[issue22379] Empty exception message of str.join

[Yongzhi Pan]

Yongzhi Pan added the comment:

I have updated the test for 3.5. The related tests pass after the patching. Are they OK now? 

There are two caveats: I did not update test_bytes in 2.7, and I did not add checkraises in test_bytes in 3.5.

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Added file: http://bugs.python.org/file36621/test_for_35-1.diff

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