title: Pycharm import RuntimeWarning after updating to 2016.2
body: <p>After updating to new version 2016.2, I am getting</p>
  
  <pre><code>RuntimeWarning: Parent module 'tests' not found while handling absolute import
    import unittest
  RuntimeWarning: Parent module 'tests' not found while handling absolute import
    import datetime as dt
  </code></pre>
  
  <p>'tests' is a package inside my main app package, and I receive these warnings when I try to execute unit tests inside this folder. This issue only came up after updating to 2016.2. Besides the warnings, the remaining code works fine.</p>
  
  <p>Edit: This is a known issue - <a href="https://youtrack.jetbrains.com/issue/PY-20171">https://youtrack.jetbrains.com/issue/PY-20171</a>. They are suggesting to replace utrunner.py in PyCharm installation folder.</p>