piePattern : extra check on trace.marker.pattern

The styleOne function is also used by the funnelarea trace type, which has no pattern in it's schema at the moment, so extra check if pattern exists, before checking if a shape exists within the pattern.

Author: thierryVergult

src/traces/pie/style_one.js

@@ -25,7 +25,7 @@ module.exports = function styleOne(s, pt, trace, gd) {
     // enforce the point color, when colors (with s) & the pattern shape are missing.
     // 'abuse' the color attribute, used in the Drawing component for bar trace type.
     // alternative could be to pass the point color as an extra parameter in pointStyle
-    if(!trace.marker.colors && !trace.marker.pattern.shape) trace.marker.color = pt.color;
+    if(!trace.marker.colors && trace.marker.pattern && !trace.marker.pattern.shape) trace.marker.color = pt.color;
 
     Drawing.pointStyle(s, trace, gd);
     // to do : push into s.style d3 logic