Undeclared variables on two lines

Plupload image field gave me two notices which caused errors with the Ajax upload and annoying messages.

![Ska rmavbild 2013-02-19 kl 16 04 55](https://f.cloud.github.com/assets/448541/171750/8dd4c76c-7aa6-11e2-9429-9e89769eedb9.png)