Check for no data condition in os_files_update_7010 and 7011

Issue #5898 is related to a divide by zero error in the case where a user has no file descriptions in os_files_update_7010.  The fix checks for the no data condition and return immediately if indeed there is no data.  As the same divide by zero error was possible in os_files_update_7011 (but for Media Titles in this case) the same fix is applied to it.