title: FusionCharts HeatMap: Display zeroes instead of blanks/missing values
body: <p>Is it possible to display "0" in FusionCharts Heatmap instead of blanks (missing values)? For example now it looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/ekKYr.png" alt="FusionCharts Heatmap"></p>
  
  <p>I'd like to display 0 instead of missing/blank values.</p>