Adds check for invalid PIDs to islandora_object_load fails

islandora.module

@@ -1230,7 +1230,14 @@ function islandora_object_load($object_id) {
         return FALSE;
       }
       else {
-        return NULL;
+        module_load_include('inc', 'islandora', 'includes/utilities');
+        if (!islandora_is_valid_pid($object_id)) {
+          watchdog('islandora', 'Failed to load invalid PID: @pid', array('@pid' => $object_id), WATCHDOG_ERROR);
+          return FALSE;
+        }
+        else {
+          return NULL;
+        }
       }
     }
   }