fixed bug that assumes arrayFields always present

Author: rueckstiess

src/minicharts/array-root.jade

@@ -6,9 +6,9 @@ div(data-hook='viz-container')
       ul.list-inline
         each name, idx in fieldNames
           li= name + (idx < fieldNames.length-1 ? ',' : '')
-    dt array lengths
-    dd 
-      ul.list-inline
-        li min: #{min_length}, 
-        li average: #{average_length}, 
-        li max: #{max_length}
+  dt array lengths
+  dd 
+    ul.list-inline
+      li min: #{min_length}, 
+      li average: #{average_length}, 
+      li max: #{max_length}

src/minicharts/array-root.js

@@ -12,7 +12,7 @@ module.exports = VizView.extend({
       min_length: _.min(this.model.lengths),
       max_length: _.max(this.model.lengths)
     };
-    if (this.model.parent.arrayFields.length > 0) {
+    if (this.model.parent.arrayFields) {
       parsed.fieldNames = this.model.parent.arrayFields.pluck('name');
       parsed.fieldsPluralized = pluralize('nested field', parsed.fieldNames.length, true);
     }