Add debug code

Author: camdecoster

src/plots/map/map.js

@@ -368,8 +368,9 @@ proto.resolveOnRender = function(resolve) {
 proto.rejectOnError = function(reject) {
     var map = this.map;
 
-    function handler() {
-        reject(new Error(constants.mapOnErrorMsg));
+    function handler(e) {
+        console.error('Map error event:', JSON.stringify(e));
+        reject(new Error(JSON.stringify(e)));
     }
 
     map.once('error', handler);

src/plots/mapbox/mapbox.js

@@ -358,8 +358,9 @@ proto.resolveOnRender = function(resolve) {
 proto.rejectOnError = function(reject) {
     var map = this.map;
 
-    function handler() {
-        reject(new Error(constants.mapOnErrorMsg));
+    function handler(e) {
+        console.error('Map error event:', JSON.stringify(e));
+        reject(new Error(JSON.stringify(e)));
     }
 
     map.once('error', handler);