title: Highcharts. Explicit colour for one point in HeatMap
body: <p>I have got a heat map with this colours:</p>
  
  <pre><code>colorAxis: {
          min: 0,
          max: 1,
          minColor: '#a50022',
          maxColor: '#007340',
          gridLineColor: '#000000',
          stops: [
              [0, '#a50022'],
              [0.5, '#fffbbc'],
              [1, '#007340']
          ],
      },
  </code></pre>
  
  <p>It works good, but now, I would like to define a color for some cases when I dont receive a value (between 0 and 1) but a string, so I can receive a "WARNING" and I would like to give it the colour red. For that I have tried to do this:</p>
  
  <pre><code>dataClasses: [{
            name: "WARNING",
            color: '#a50022',
          },
          ],
  </code></pre>
  
  <p>And when I create the series:</p>
  
  <pre><code>myData.push([column, row , "WARNING"]);
  </code></pre>
  
  <p>This doesnt work, it is shown in black. I have also tried:</p>
  
  <pre><code>myData.push({y:[column, row ,"WARNING"],name:"WARNING"});
  </code></pre>
  
  <p>And everything crashes with this, no data shown.</p>
  
  <p>In this case, I will only receive strings, no values, so I could delete the stops, min, max and that stuff. So I would just need a "heat map" where I could define the colours for each string value.</p>