When user edits a website, he must change the site's title

When a user edits a website (for instance to fill in the metadata or change the description) and he click on "Save", he is displayed a message saying that a website with the url already exists. The only way to save the modifications is to actually change the site's title.

Once the site's title has been changed, he can edit the site again without being displayed this message.

Same thing occurs on blogs.