Jetpack: Media Extractor: Tidy up some indefined indices warnings if parse_url returns false.

http://wordpress.org/support/topic/error-in-media-extractorphp?replies=6


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@813804 b8457f37-d9ea-0310-8a92-e5e31aec5664