Handle the case where no module found

Author: rreusser

src/plot_api/plot_api.js

@@ -2572,7 +2572,7 @@ Plotly.transition = function(gd, data, layout, traceIndices, transitionConfig) {
             var trace = gd._fullData[traceIdx];
             var module = trace._module;
 
-            if(!module.animatable) {
+            if(!module || !module.animatable) {
                 continue;
             }
 
@@ -2658,6 +2658,8 @@ Plotly.transition = function(gd, data, layout, traceIndices, transitionConfig) {
         var contFull = gd._fullData[traceIdx];
         var module = contFull._module;
 
+        if (!module) continue;
+
         if(!module.animatable) {
             var thisUpdate = {};