Images smaller than thumbnail size

If the image size for a product is smaller than the configured thumbnail size the thumbnail file does not created created and no image is displayed.

Tracked this down to generateThumbnail($file_path) in image.php returning true when it should return false.

A quick fix is to change line 174. From:

if (isset ($gd["GD Version"])) {
  $ok = true;
  $gd_ok = true;
  ...

if (isset ($gd["GD Version"])) {
  $ok = false;  // Change this line
  $gd_ok = true;
  ...