Issue decoding byte string to utf-8 due to provided encoding is None

[rasjani]

Im getting following error when running unittests with IronPython:

2019-01-02T11:45:28.1639634Z 
2019-01-02T11:45:28.1639798Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\runner.py", line 113, in run
2019-01-02T11:45:28.1640448Z 
2019-01-02T11:45:28.1640700Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\result.py", line 550, in generate_reports
2019-01-02T11:45:28.1640941Z 
2019-01-02T11:45:28.1641087Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\result.py", line 469, in _createCDATAsections
2019-01-02T11:45:28.1641692Z 
2019-01-02T11:45:28.1641966Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\result.py", line 442, in _report_testsuite
2019-01-02T11:45:28.1643263Z 
2019-01-02T11:45:28.1643532Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\result.py", line 72, in safe_unicode
2019-01-02T11:45:28.1644257Z 
2019-01-02T11:45:28.1644437Z   File "C:\Users\VssAdministrator\AppData\Roaming\Python\IronPython27\site-packages\xmlrunner\result.py", line 56, in xml_safe_unicode
2019-01-02T11:45:28.1644550Z 
2019-01-02T11:45:28.1644626Z TypeError: decode() expected string, got 'NoneType'

the issue seems to be that when safe_unicode is called within results.py, encoding is never passed in - and then the default value of None is then passed forward to xml_safe_unicode. On IronPython, this then triggers base.encode() call but encoding is None.

Maybe the quick fix would be to change the default value of encoding in safe_unicode to "utf-8" ?

[rasjani]

pushed changed to pypi and ran my tests with with ironpython 2.7 and xml gets generated just fine so i'd say this is definitely a bug fix is really easy.