* A handler must be able to handle undefined component-medias of the container;
  e.g.: "
    [...]

    RealizationOptions[1]='readahead=auto'
    SIZES[1]='16'

    RealizationOptions[3]='readahead=auto'
    SIZES[3]='16'

    [...]
  "; here the media with thin-id = 2 is not defined.