title: Jenkins with pylint gives build failure
body: <p>I added a build step to execute a Python script.<br>
  In this script pylint is called with the lint.Run(..args) to check the code.<br>
  The script works but in the end, the build fails with the only error message:   </p>
  
  <p><code>Build step 'Execute Python script' marked build as failure</code></p>
  
  <p>Someone has an idea why this happens?</p>