Twitch API challenge placeholder logo images?

Hello,

So I’m writing the Twitch API challenge, and I was wondering if there exists a placeholder logo I can use for users that are no longer available, deleted their account, or don’t have a logo associated with their channel?

Thank you.

Here’s what I use. I’m pretty sure I got it directly from Twitch:

http://static-cdn.jtvnw.net/jtv_user_pictures/xarth/404_user_150x150.png

I was looking everywhere for something official, but came out dry until now, thanks!