a7f085d KRB5: Remove spurious warning in logs

Authored and Committed by lslebodn 7 years ago
    KRB5: Remove spurious warning in logs
    
    The option krb5_map_user is empty by default.
    Therefore we should not confuse users wih warning
    
    (Fri Nov 15 09:58:49 2016) [sssd[be[example.com]]] [parse_krb5_map_user]
    (0x0200): Warning: krb5_map_user is empty!
    
    Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>