title: is it possible to ignore 0 values when creating a graph in dygraph
body: <pre><code>&lt;html&gt;
  &lt;head&gt;
  &lt;script type="text/javascript"
    src="dygraph-combined.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div id="graphdiv"&gt;&lt;/div&gt;
  &lt;script type="text/javascript"&gt;
    g = new Dygraph(
  
      // containing div
      document.getElementById("graphdiv"),
  
      // CSV or path to a CSV file.
      "Date,Duration,Error\n" +
      "2008-05-07,75,23\n" +
      "2008-05-08,70,45\n" +
      "2008-05-09,70,0\n" +
      "2008-05-10,70,23\n" +
      "2008-05-11,70,11\n" +
      "2008-05-12,70,\n" +
      "2008-05-13,80,33\n",
       {
          // options go here. See http://dygraphs.com/options.html
          legend: 'always',
          animatedZooms: true,
          title: 'dygraphs chart template',
      includeZero: false
       }
    );
  &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Is it possible to for the graph to ignore the zero or null values so it connects directly from 45 to 23 or 11 to 33. in excel we the option does this option exists? incluedZero does not seem to have any affect.</p>