title: Chart disappears just after finishing animation
body: <p>I'm trying to use <code>chartjs</code>, so I copied sample code from <a href="http://www.chartjs.org/docs/" rel="nofollow">official document</a> like this. </p>
  
  <pre><code>&lt;canvas id="myChart" width="400" height="400"&gt;&lt;/canvas&gt;
  &lt;script&gt;
   var data = {
     labels : ["January","February","March","April","May","June","July"],
     datasets : [
   {
     fillColor : "rgba(220,220,220,0.5)",
     strokeColor : "rgba(220,220,220,1)",
     pointColor : "rgba(220,220,220,1)",
     pointStrokeColor : "#fff",
     data : [65,59,90,81,56,55,40]
   },
   {
     fillColor : "rgba(151,187,205,0.5)",
     strokeColor : "rgba(151,187,205,1)",
     pointColor : "rgba(151,187,205,1)",
     pointStrokeColor : "#fff",
     data : [28,48,40,19,96,27,100]
   }
     ]
   }
   //Get the context of the canvas element we want to select
   var ctx = document.getElementById("myChart").getContext("2d");
   var myNewChart = new Chart(ctx).PolarArea(data);
   new Chart(ctx).Line(data);
  &lt;/script&gt;
  </code></pre>
  
  <p>Example: <a href="http://jsfiddle.net/DerekL/FZW9z/" rel="nofollow">http://jsfiddle.net/DerekL/FZW9z/</a></p>
  
  <p>The Chart appears at first, but when first animation ends it disappears.
  Javascript console shows nothing. And when a option <code>animation</code> is defined <code>false</code>, then it appears only split second and disappears likewise.</p>
  
  <p>I tried in Firefox and Chrome in Mac, but results were same.</p>
  
  <p>How does it happens, and how can I fix it?</p>