Use the same number of colors as calcdata + 1: because that num is not always correct

Author: VeraZab

src/components/fields/Colorscale.js

@@ -13,7 +13,7 @@ class Colorscale extends Component {
   onUpdate(colorscale, colorscaleType) {
     if (Array.isArray(colorscale)) {
       if (this.context.container.type === 'pie') {
-        const numPieSlices = this.context.container.labels.length;
+        const numPieSlices = this.context.graphDiv.calcdata[0].length + 1;
         const adjustedColorscale = adjustColorscale(
           colorscale,
           numPieSlices,