Ticket #471 logconv.pl tool removes the access logs contents if "-M" is not correctly used
    
    https://fedorahosted.org/389/ticket/471
    Reviewed by: nhosoi (Thanks!)
    Branch: 389-ds-base-1.3.2
    Fix Description: Do not call new_stats_block() until we verify that it is safe
    to call it.  It will wipe out the file.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit 7447050f572fb8865145d020e9eab64032f667be)