- if $release { "a=${release}" },
- if $codename { "n=${codename}" },
- if $release_version { "v=${release_version}"},
- if $component { "c=${component}" },
- if $originator { "o=${originator}" },
- if $label { "l=${label}" },
+ unless $release =~ Undef { "a=${release}" },
+ unless $codename =~ Undef { "n=${codename}" },
+ unless $release_version =~ Undef { "v=${release_version}"},
+ unless $component =~ Undef { "c=${component}" },
+ unless $originator =~ Undef { "o=${originator}" },
+ unless $label =~ Undef { "l=${label}" },