title: Django Model Graph (pydot) Error
body: <p>I have recently started working on a big Django project with existing complicated model. I needed to visualize that model, so I decided to use django-extensions (namely <strong>pygraphviz</strong>). But unfortunately, failed to install <strong>pygraphviz</strong> on windows using pip, so I installed <strong>pydot</strong>.</p>
  
  <p>When Running the following command on windows cmd:</p>
  
  <pre><code>python manage.py graph_models --pydot -a -g -o my_project_visualized.png
  </code></pre>
  
  <p>I get the following Error:</p>
  
  <pre><code>AttributeError: 'list' object has no attribute 'write'
  </code></pre>
  
  <p>Any Suggestion of how to solve this issue?</p>