PyBuilder improperly handles syntactical errors in test being loaded

[arcivanov]

Details here:

https://gitter.im/pybuilder/pybuilder?at=6077844f81866c680c23d17d

Logs here:

https://files.gitter.im/5a174492d73408ce4f800535/d6Uj/build_logs.txt

[hoxu]

I believe this is the same case I was seeing, with the symptom being:

BUILD FAILED - TypeError: 'NoneType' object is not callable (xmlrunner/runner.py:66)

For the people coming here from search, -vX -Premote_debug=2 parameters to pyb will unearth the actual issue, which in my case was:

[DEBUG/MainProcess] received (0, TypeError('__init__() takes 1 positional argument but 2 were given'))

[arcivanov]

@hoxu thanks for your report!