[CLC-2204] Missing images for videos and private collections

https://jira.media.berkeley.edu/jira/browse/CLC-2204
![screen shot 2013-07-16 at 6 02 14 pm](https://f.cloud.github.com/assets/323477/809205/8e7ed686-ee7c-11e2-8027-9bcce2b2f05e.png)
![screen shot 2013-07-16 at 6 02 06 pm](https://f.cloud.github.com/assets/323477/809206/8e8fedd6-ee7c-11e2-8c63-c35a7ea79d0a.png)