Fixed some strict warnings - edge case where a blog page is available, but no blogs have been published yet
PHP 5.4 Strict warnings
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo into Bugfix-some-PHP-strict-warnings

Conflicts:
	readme.txt
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo into Bugfix-some-PHP-strict-warnings

Conflicts:
	readme.txt
Fix potential 'headers already send' error
Adding fixes suggested in issue #180
Merge pull request #181 from jrfnl/Bugfix-some-PHP-warnings

Fix some php warnings