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** Branch linked: lp:~gz/testtools/no_source_line_611307

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Unicode tracebacks break when a line is None rather than str
https://bugs.launchpad.net/bugs/611307
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Status in Extensions to the Python unittest library: New

Bug description:
Using traceback.extract_tb may return None for the source line rather than a str, if for instance it comes from a bytecode file or an evaled statement. In that case, the Python 2 unicode tracebacks code should not attempt to decode it.