Views Datasource JSON Video field should be empty but it contains a url

Question

I'm trying to use the the views_datasource module and I like it. I'm having one issue though and wondering if you can help. My Article nodes have a field_video which is optional. In the generated JSON, the nodes which do not have a Video should have either an empty field in the JSON or just not have that key-value pair at all. This is the json I'm seeing get generated:

"node" : {
    "title" : "<a href=\"/blog/new-post\">New Post</a>",
    "body" : "<p>Lorem ipsum...</p>\n",
    "field_image" : "http://mysubdomain.rackcdn.com/field/image/C04DD9F4CC2E691B2DFEA107CEDD8F13.jpg",
    "path" : "/blog/new-post",
    "created" : "Sunday, November, 2012",
    "field_video" : "http://drupal.mydomain.com/"
}

The field_video has the value "http://drupal.mydomain.com/" but I would expect it to either be empty "" or null or have the key-value pair not exist at all.

I've configured the Video field in the View so that the "No Results Behavior" is that it should be hidden... but it's not being hidden:

How can I make this field really empty?