prevent undefined opacities in colors_style

src/services/map-service.js

@@ -343,7 +343,7 @@ const mapService = {
     const colorsStyle = featureType.colors_style;
     if (featureType && colorsStyle && colorsStyle.custom_field_name) {
       const currentValue = properties[colorsStyle.custom_field_name];
-      if (currentValue) {
+      if (currentValue && colorsStyle.opacities) {
         const colorStyle = colorsStyle.opacities[currentValue];
         return parseFloat(colorStyle ? colorStyle : featureType.opacity);
       }