updated getCollectionQuery to call out an alter for other modules to update the query (specifically for the xacml module, but others could alter as well)

CollectionClass.inc

@@ -34,12 +34,12 @@ class CollectionClass {
   }
   
   public static function getCollectionQuery($pid) {
-    if ($query = self::getCollectionQueryFromStream($pid)) {
-      return $query;
-    }
-    else {
-      return self::getDefaultCollectionQuery($pid);
+    $query = self::getCollectionQueryFromStream($pid);
+    if (!$query) {
+      $query = self::getDefaultCollectionQuery($pid);
     }
+    drupal_alter("islandora_collection_query", $query, $pid);
+    return $query;
   }
   
   protected static function getCollectionQueryFromStream($pid) {