default should actually be [',']

Author: joker-777

app/javascript/activeadmin_addons/inputs/tags.js

@@ -18,7 +18,7 @@ var initializer = function() {
         multiple: true,
         tags: true,
         data: collection,
-        tokenSeparators: $(el).data('tokenSeparators')
+        tokenSeparators: $(el).data('tokenSeparators') || [',']
       };
 
       if (!!isRelation) {