Hey!

I'm using 1.4.6-BETA [4196c58634].

I made my own theme, and I followed your theming tutorial which links to:
https://github.com/zenphoto/DevTools/blob/master/demo_plugin-and-theme/demo_theme-basic-files/image.php

This page has the following line to display the image:
`

Of course a variable needs to have assigned a value in PHP to be valid and existing. This is clearly a typo in the demo file. It should be actually:
`

Glad to be of service :]