openldap ber_init will assert if the bv->bv_val is NULL
    
    Have to ensure that all usage of ber_init in the server checks to see if
    the bv->bv_val is non-NULL before using ber_init, and return the appropriate
    error if it is NULL
    Also fixed a problem in dna_extend_exop - would not send the ldap result to
    the client in certain error conditions
    Reviewed by: nhosoi (Thanks!)
    Tested on: RHEL5 x86_64