Hide the "Links" box when there are no links

[abjerner]

We're usually having some content types that aren't directly accessible from the website, and therefore it doesn't really make sense to show the Links box under the Info tab as the URL doesn't work anyways.

With the SendingContentModel event, we can make sure that the box doesn't contain any links:

EditorModelEventManager.SendingContentModel += (sender, e) => {
    e.Model.Urls = null;
};

But the box is still being shown. With this PR, the Links box will be hidden when node.urls is either null or empty.

Before:

After:

[dawoe]

LOL.. I had this on my list as well. I have this as example in my Duugfest talk next friday and I also noticed the links box is there.

But code looks good to me.

Dave

[dawoe]

@nul800sebastiaan I can confirm this fixes the issue

[nul800sebastiaan]

Yes it does! 👍