Any link can be useful in building your link profile, whether it's coded as "nofollow" or not. Google may not allow "nofollow" links to pass PageRank, but that doesn't necessarily mean they totally ignore them. Your link profile is not just about "link juice" -- they also take a look at the kinds
of links you have.
Now, as to this specific link -- first, it's a link from
a Google-controlled website. They don't need to code it as "nofollow" to know that it's a link you can create yourself, and therefore less valuable than an editorial link bestowed by someone else.
In fact, Google can (and does) prevent all sorts of links from passing "juice," even if they're not
coded "nofollow." All they have to do is decide they're not going to "count" the links from any site, for any reason, and suddenly links from that site won't do you any good in terms of PageRank.
Meaning that just because a link doesn't have a "nofollow" code on it, that doesn't mean it definitely passes PageRank.
Again, this is not to say that these links can't count in your favor (or to your detriment, depending on the reputation of the site) in terms of your overall link profile. It just means they're not going to pass any "link juice" to your page.
Generally speaking, any link you can place yourself will be less valuable than a link that another outside webmaster gives you because they are impressed with your content.