PyCharm 2017.3 causing issues when nosetests runs into errors (Python Selenium)

After upgrading to PyCharm 2017.3 I am not able to run my tests properly. Any time an error is encountered, the test case does not fail and move on, it just stops executing. Downgrading to PyCharm 2017.2.4 resolves the problem.

Here are the errors I get:", line 17, in

... etc etc etc .....

in formatError
ec, ev, tb = err
TypeError: 'NoneType' object is not iterable