Add a couple more access checks.

includes/utilities.inc

@@ -389,7 +389,7 @@ function islandora_get_datastreams_requirements_from_models(array $models) {
  *     - "optional": A boolean indicating if the given stream is optional.
  */
 function islandora_get_datastreams_requirements_from_content_model(AbstractObject $object) {
-  if (empty($object[DS_COMP_STREAM])) {
+  if (empty($object[DS_COMP_STREAM]) || !islandora_datastream_access(FEDORA_VIEW_OBJECTS, $object[DS_COMP_STREAM])) {
     return array();
   }
   $xml = new SimpleXMLElement($object[DS_COMP_STREAM]->content);

theme/theme.inc

@@ -203,7 +203,7 @@ function islandora_preprocess_islandora_objects(array &$variables) {
       theme('image', array('path' => url("$url/datastream/TN/view"), 'attributes' => array())) :
       '';
     $description = NULL;
-    if (islandora_datastream_access($o['DC'])) {
+    if (isset($o['DC']) && islandora_datastream_access(FEDORA_VIEW_OBJECTS, $o['DC'])) {
       $dc = DublinCore::importFromXMLString($o['DC']->content);
       if ($dc) {
         $dc = $dc->asArray();