Google Feed API - not returning feed URLs - json

Question

When I use the Google Feed API's find search, a lot of the time it's not returning the URLs of the feed.
As an example, a find search for the query 'CNN', points to this URL:
https://ajax.googleapis.com/ajax/services/feed/find?v=1.0&q=cnn
And returns these results (trimmed):
{
"responseData": {
"query": "cnn",
"entries": [
{
"url": "",
"title": "<b>CNN</b>.com: Breaking News, US, World, Weather, Entertainment <b>...</b>",
"contentSnippet": "Find the latest breaking news and information on the top stories, weather, <br>\nbusiness, entertainment, politics, and more. For in-depth coverage, <b>CNN</b> <br>\nprovides ...",
"link": "http://www.cnn.com/"
},
{
"url": "",
"title": "World News - International Headlines, Stories and Video - <b>CNN</b>.com",
"contentSnippet": "<b>CNN</b> brings you International News stories, video and headlines from Europe, <br>\nAsia, Africa, the Middle East, and the Americas.",
"link": "http://www.cnn.com/world"
},
{
"url": "",
"title": "U.S. News - Headlines, Stories and Video - <b>CNN</b>.com",
"contentSnippet": "<b>CNN</b>.com brings you US News, Videos and Stories from around the country.",
"link": "http://www.cnn.com/us"
},
{
"url": "",
"title": "<b>CNN</b> (#<b>CNN</b>) | Twitter",
"contentSnippet": "The latest Tweets from <b>CNN</b> (#<b>CNN</b>). It's our job to #GoThere and tell the most <br>\ndifficult stories. Come with us!",
"link": "https://twitter.com/cnn"
},
{
"url": "http://gdata.youtube.com/feeds/base/users/CNN/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile",
"title": "<b>CNN</b> - YouTube",
"contentSnippet": "<b>CNN</b> operates as a division of Turner Broadcasting System, which is a subsidiary <br>\nof Time Warner. <b>CNN</b> identifies itself as -- and is widely known to be - the m...",
"link": "http://www.youtube.com/user/CNN"
}
]
},
"responseDetails": null,
"responseStatus": 200
}
The first 4 results don't have a URL attached. The 5th one does, but isn't relevant, so my initial idea to remove items with empty URLs wouldn't work.
Following the basic query example on their developer guide, their example shows the url field of the results filled in. Copy and pasting the URL they provided shows similar results, but without the url field filled out.
Unless I'm mistaken, this seems like it must be a problem with Google's results.