Added some checks to the displayMetadata method so that it does not cause errors if the exif datastream is empty or missing.

plugins/Exiftool.inc

@@ -32,6 +32,8 @@ class Exiftool {
   
   function displayMetadata() { 
     $output='';
+		$exif = $this->item->get_datastream_dissemination('EXIF'); 
+		if (trim($exif) != '')  {
 	    $exifDom = DOMDocument::loadXML($this->item->get_datastream_dissemination('EXIF'));
   	  if ($exifDom != NULL) {
 	      $description = $exifDom->getElementsByTagNameNS('http://www.w3.org/1999/02/22-rdf-syntax-ns#','Description');
@@ -58,6 +60,7 @@ class Exiftool {
 					$output  = theme('fieldset', $fieldset);
 	      }
   	  }
+	  }
     return $output;
   }