Add missing plugin section, and deal with missing sections with a warning.

IkiWiki/Plugin/underlay.pm

@@ -18,6 +18,7 @@ sub getsetup () {
 		plugin => {
 			safe => 0,
 			rebuild => undef,
+			section => "special-purpose",
 		},
 		add_underlays => {
 			type => "string",

IkiWiki/Setup.pm

@@ -223,6 +223,10 @@ sub commented_dump ($$) {
 		my $setup=$pair->[1];
 		my %s=@{$setup};
 		my $section=$s{plugin}->{section};
+		if (! defined $section) {
+			print STDERR "warning: missing section in $plugin\n";
+			$section="other";
+		}
 		push @{$section_plugins{$section}}, $plugin;
 		if (@{$section_plugins{$section}} == 1) {
 			push @ret, "", $indent.("#" x 70), "$indent# $section plugins",

debian/changelog

@@ -1,6 +1,7 @@
 ikiwiki (3.20130213) UNRELEASED; urgency=low
 
   * Allow dots in directive parameter names. (tango)
+  * Add missing plugin section, and deal with missing sections with a warning.
 
  -- Joey Hess <joeyh@debian.org>  Fri, 15 Feb 2013 17:23:12 -0400