Fix Headers for FlowPlayer

FlowPlayer requires the "Content-Length" header to be returned in order to work properly,
but it wasn't getting returned in the header when a user was not logged in.
A slight change to the semantics, and opening up of the getDatastream API-M method via
XACML seems to work.

ObjectHelper.inc

@@ -94,13 +94,13 @@ class ObjectHelper {
     if ((!isset($user)) || $user->uid == 0) {
       $fedoraUser = 'anonymous';
       $fedoraPass = 'anonymous';
-      $contentSize = 0;
     } else {
       $fedoraUser = $user->name;
       $fedoraPass = $user->pass;
-      $dataStreamInfo = $item->get_datastream_info($dsID);
-      $contentSize = $dataStreamInfo->datastream->size;
     }
+    
+    $dataStreamInfo = $item->get_datastream_info($dsID);
+    $contentSize = $dataStreamInfo->datastream->size;
 
     if (function_exists("curl_init")) {
       if (!isset($mimeType)) {