Invalid argument supplied for foreach() in ... images.previewlist.imagefield.inc on line 44

I'm getting a php warning when uploading images using the imagefield single image per node method. The exact error is:

warning: Invalid argument supplied for foreach() in .../sites/all/modules/image_fupload/includes/images.previewlist.imagefield.inc on line 44. 

I have a taxonomy field with a vocabulary that does not allow "tags". So when the code hits that line of code:
foreach ($form_taxonomy['taxonomy']['tags'] as $key => $value) {

The tags attribute hasn't been set so it prints the warning.

Adding if (is_array($form_taxonomy['taxonomy']['tags'])) before the for loop fixes the issue.

    if (is_array($form_taxonomy['taxonomy']['tags'])) {
      foreach ($form_taxonomy['taxonomy']['tags'] as $key => $value) {
        // taxonomy tags
        if (!in_array($key, $fields_preview_list['taxonomy'])) {        
          unset($form_taxonomy['taxonomy']['tags'][$key]);
        }
      }
    }