using the following feed:

<http://api.twitter.com/1/statuses/user_timeline.json?screen_name=microsoft&include_rts=1&count=10>

I am successfully able to loop through this to get the details I want to display on my html page.

However, I need to check if `retweeted_status.user.profile_image_url` exists, and I am not sure how to do that?

Currently I am looping through the data where `data` is returned by jquery-ajax:

`data[i].retweeted_status.user.profile_image_url`

if `data[i].retweeted_status.user.profile_image_url` does not exist, it does not return null or undefined, I just get the following error:

`cannot read property 'user' of undefined`