title: No generation of the module index "modindex" when using Sphinx
body: <p>I have troubles creating a document directory (html) using sphinx-build.</p>
  
  <p>I tried </p>
  
  <pre><code>sphinx-build -b html source build
  </code></pre>
  
  <p>as well as</p>
  
  <pre><code>make html
  </code></pre>
  
  <p>but in both cases only the html-files search.html, index.html and genindex.html are generated. The file modindex.html is missing. </p>
  
  <p>In the file conf.py I set</p>
  
  <pre><code>html_domain_indices = True
  </code></pre>
  
  <p>so I should have a modindex.html file. What am I doing wrong? I get no error message after building the html files. I'm using Sphinx 1.1.3 and Python 2.7 on Windows XP.</p>