title: Not a valid 2d array google chart
body: <p>I have the current code that attempts to build a 2d array for the google charts.</p>
  
  <p>However I get an invalid 2D array error.</p>
  
  <p>What am i doing wrong?  Thank you in advance</p>
  
  <pre><code>//Request data
          $.getJSON(api,function(data){
  
              //Init final array for data
              var finalData = [["SessionLength"]];
  
              //Iterate over results
              for (var key in data){
  
                  //Get the key pair
                   var keyPair = [key, parseInt(data[key])];
  
                  //Add to array
                   finalData.push(keyPair);
               }
  
              // Create the data table.
              var data = google.visualization.arrayToDataTable(finalData);
  
              // Set chart options
              var options = {'title':'Average session length',
                  'width':400,
                  'height':400};
  
              // Instantiate and draw our chart, passing in some options.
              var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
              chart.draw(data, options);
          });
  </code></pre>
  
  <p>This is the JSON</p>
  
  <pre><code>{"2013-8-5":"13.5","2013-7-29":"19.7","2013-8-4":"12.2","2013-8-3":"14.1","2013-8-2":"10.1","2013-7-31":"15.1","2013-7-30":"17.4","2013-8-6":"16.0","2013-8-1":"15.0"}
  </code></pre>