Updated based on feedback in pull request

theme/islandora-dublin-core-description.tpl.php

@@ -15,6 +15,6 @@
 <div class="islandora-metadata-sidebar">
   <?php if (!empty($dc_array['dc:description']['value'])): ?>
     <h2><?php print $dc_array['dc:description']['label']; ?></h2>
-    <p property="description"><?php print nl2br(filter_xss($dc_array['dc:description']['value'])); ?></p>
+    <p property="description"><?php print $dc_array['dc:description']['value']; ?></p>
   <?php endif; ?>
 </div>

theme/theme.inc

@@ -646,6 +646,7 @@ function islandora_preprocess_islandora_dublin_core_description(array &$variable
     }
   }
   $variables['dc_array'] = isset($dc_object) ? $dc_object->asArray() : array();
+  $variables['dc_array']['dc:description']['value'] = nl2br(filter_xss($variables['dc_array']['dc:description']['value']));
 }
 
 /**