title: Chart.js time scale not showing data
body: <p>I have a <a href="http://www.chartjs.org" rel="nofollow noreferrer">Chart.js</a> chart which was displaying fine, until I added a <a href="http://www.chartjs.org/docs/#scales-time-scale" rel="nofollow noreferrer">time scale</a> to it. The configuration looks like this:</p>
  
  <pre><code>    this.chart = new Chart(this.ctx, {
          type: 'line',
          data: data,
          options: {
              legend: {
                  display: false
              },
              scales: {
                  xAxes: [{
                      type: 'time',
                      time: {
                          unit: 'month',
                          format: 'timeFormat'
                      }
                  }]
              }
          }
      });
  </code></pre>
  
  <p>And the <code>data</code> object looks like this:</p>
  
  <pre><code>let data = {
      labels: ["1485903600", "1490738400"],
      datasets: [{
          label: '',
          data: [120, 30],
          lineTension: 0
      }]
  };
  </code></pre>
  
  <p>The x-axis displays the two dates correctly, and the y-axis is bounded by the correct limits (i.e. 120 and 30), but the data is not displaying on the graph.</p>