title: Ruby Youtube Data API gem error when deleting a playlist
body: <p>When I execute a <code>youtube.playlists.delete</code> request I am getting back</p>
  
  <pre><code>NoMethodError: undefined method `[]' for nil:NilClass
      from /Users/me/.rvm/gems/ruby-1.9.2-p320@vidyard_dashboard/gems/google-api-      client-0.4.4/lib/google/api_client/result.rb:53:in `media_type'
      from /Users/me/.rvm/gems/ruby-1.9.2-p320@vidyard_dashboard/gems/google-api-client-0.4.4/lib/google/api_client/result.rb:57:in `data?'
      from /Users/me/.rvm/gems/ruby-1.9.2-p320@vidyard_dashboard/gems/google-api-client-0.4.4/lib/google/api_client.rb:775:in `execute!'
  </code></pre>
  
  <p>The request seems to actually go through as the playlist is deleted, but for whatever reason the the still throws an error on the way back. The basic code for the request looks like:</p>
  
  <pre><code>yt.client.execute!(
      :api_method =&gt; yt.youtube.playlists.delete, 
      :parameters =&gt; {:id =&gt; 'youtube_playlist_id'}
  )
  </code></pre>