How to query for TFS work items with or without tags

Question

TFS supports querying on tags, but I can't find a way to create a TFS work item query to return results that have no tags or any tag.

It is not possible to sort the Tag column in the TFS web access, so I can't even return all work items and then sort on the column to focus on those with tags and those without tags.

For example, I was hoping to see a wild card or any for the Tags value below:

Answer 1

I'm about a year too late, but I just accomplished this by doing Tags, Does Not Contain, "". I know that makes no sense, but it worked. I was able to pull in a task that had no tag.