Ticket #48048 - Fix coverity issues - 2015/2/24
    
    Coverity defect 13078 - Explicit null dereferenced (FORWARD_NULL)
    Description: Added NULL check for conn.  If NULL, let sync_send_
    results abort there.  Also, added "return" if sync_acquire_connection
    returns non success as advertised as "aborted" in the error message.
    modified: sync_send_results in plugins/sync/sync_persist.c