Warnings about media_support in debug mode

Hi,

In the new admin-filters.php, lines 34, 63, 236 do an unchecked array dereference, which throws up warnings when WordPress runs in debug mode. Can you add

if (array_key_exists(‘media_support’, $this->options))

to these checks?

Thank you as always for the awesome plugin!
– Dave (http://cscircles.ca)

http://wordpress.org/extend/plugins/polylang/