This fixes a problem that generates an error when Contribution tracker can not reach the OSC feed, the errors unnessessarily fill the scripts log.

in catalog/includes/classes/rdf_class.php
AND
in catalog/admin/includes/classes/rdf_class.php

FIND:
if (!($fp = fopen($this->FileName, "r"))) {

REPLACE WITH:
if (!($fp = @fopen($this->FileName, "r"))) {


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