Yoast/wordpress-seo — pull request #1724 by felixcarmona (2014-11-04 22:21:02+00:00)
Title: Remove separator & sitedesc when sitedesc isn't available

When you don't have any description of your blog, the title is shown as: 'Your title -'.

As you can see, appears an extra "-" dash at the end, it must not be displayed when any blog description is available