f5d6521 Fix DNS upgrade plugin should check if DNS container exists

1 file Authored by mbasti 9 years ago, Committed by pviktori 9 years ago,
    Fix DNS upgrade plugin should check if DNS container exists
    
    Fortunately this cause no error, because dnszone-find doesnt raise
    exception if there is no DNS container
    
    Reviewed-By: Petr Viktorin <pviktori@redhat.com>