Notice: Undefined index: #attributes in radix_container() in /themes/radix/includes/form.inc

After commit of #5 commit of #attribute on https://www.drupal.org/node/2627442 , I am still getting the same warning due to is_array() throwing exception

$element['#attributes'] = is_array($element['#attributes']) ? $element['#attributes'] : array();

In this when the condition of is_array() is true then it means that $element[#attributes] is defined but when the condition is false then it means that in element #attributes is not defined so it is throwing the exception.
When condition is true then everything works fine but when it is not then it does not work fine.
So when i tried !empty instead of is_array() it worked for me.

$element['#attributes'] = !empty($element['#attributes']) ? $element['#attributes'] : array();