Call to get_file_list throws exception instead of returning NULL

Version 1
    This document was generated from CDN thread

    Created by: Jason Gullickson on 19-01-2011 12:39:27 PM
    The developer documentation states that when no files are available for the specified time range that the call will return NULL; however instead it is throwing an exception that indicates that there are no files in the range.
    Is this by design?