Fix up og:description for missing statement
Fix up og:description for missing statement

For users without a statement, put a generic description in for their
statement.

eXcomm/gratipay.com,eXcomm/gratipay.com,studio666/gratipay.com,studio666/gratipay.com,mccolgst/www.gittip.com,gratipay/gratipay.com,bountysource/www.gittip.com,mccolgst/www.gittip.com,eXcomm/gratipay.com,bountysource/www.gittip.com,bountysource/www.gittip.com,eXcomm/gratipay.com,bountysource/www.gittip.com,mccolgst/www.gittip.com,gratipay/gratipay.com,studio666/gratipay.com,mccolgst/www.gittip.com,gratipay/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com