title: JGIT pull error: No value for key branch.master.merge found in configuration
body: <p>Using jgit, I am writing codes on ToolTwist Controller that will automatically synch (pull and push) local repository to github but I am getting this error when trying to call pull command:</p>
  
  <pre><code>org.eclipse.jgit.api.errors.InvalidConfigurationException: No value for key branch.master.merge found in configuration
  </code></pre>
  
  <p>Take notes that push command work fine.</p>