Required input fileds are not wrapped in error-tags

Hello,

First of all, thanks alot for this great module! Much better user experience than the normal comma-seperated way.
I found one little bug. If Active Tags is used on a required taxonomy and this field is left empty, the field is not wrapped in a "required error" tag like Drupal usually do. So it's not possible to theme such fields, e.g. putting a red border around it.