jdevalk/wordpress-seo — pull request #120 by jrfnl (2013-07-20 10:53:10+00:00)
Title: Fix no empty twitter tags

Checked all twitter and opengraph methods for:

* proper html, i.e. "..." not '...' for attributes
* avoiding sending empty tags - especially with all the filters, you never know whether they are used properly
* proper use of esc_attr()/esc_url()

Seen various questions on the forum about this already, so this should shut them up ;-)