Index: image.module
===================================================================
RCS file: /cvs/drupal/contributions/modules/image/image.module,v
retrieving revision 1.197
diff -u -r1.197 image.module
--- image.module	2 May 2006 06:54:35 -0000	1.197
+++ image.module	12 Jun 2006 16:30:26 -0000
@@ -299,6 +299,14 @@
   if (empty($node->images['preview'])) {
     $node->images['preview'] = $node->images['_original'];
   }
+  // assign any empty custom image sizes to original
+  // so that small images that didn't get derivatives are not NULL
+  $sizes = _image_get_sizes();
+  foreach ($sizes as $size) {
+  	if(!$node->images[$size['label']]){
+      $node->images[$size['label']] = $node->images['_original'];
+  	}
+  }
 }
 
 /**