Minor display error in bulletin preview when a prereq is removed or added.

library/App/View/Helper/BulletinEntryDiff.php

@@ -70,8 +70,14 @@ class App_View_Helper_BulletinEntryDiff
         $diffActivities = $this->_getDiffText($currentActivities, $proposedActivities);
 
 
-
-        $diffPrereq = $this->_getDiffText($currentCourse->getPrerequisite(), $proposedCourse->getPrerequisite());
+        if ($currentPrereq = $currentCourse->getPrerequisite()) {
+        	$currentPrereq = 'Prereq: ' . $currentPrereq;
+        }
+        if ($proposedPrereq = $proposedCourse->getPrerequisite()) {
+        	$proposedPrereq = 'Prereq: ' . $proposedPrereq;
+        }
+        $diffPrereq = $this->_getDiffText($currentPrereq, $proposedPrereq);
+        
         $diffNotes = $this->_getDiffText($currentCourse->getNotes(), $proposedCourse->getNotes());
         $diffDescription = $this->_getDiffText($currentCourse->getDescription(), $proposedCourse->getDescription());
 
@@ -111,7 +117,7 @@ class App_View_Helper_BulletinEntryDiff
 
                 ?>
                 <?php if($diffPrereq != '') { ?>
-                Prereq: <?php echo $diffPrereq; ?>
+                <?php echo $diffPrereq; ?>
                 <?php } ?>
                 <em><?php echo $diffNotes; ?></em>
             </div>