If we fail to find a requested namespace, we should tell the user
which ones we know about, since those were already fetched. This
allows users to fetch all namespaces by specifying a dummy namespace,
failing, then copying the list of namespaces in the config.

Eventually, we should have a flag that allows fetching all namespaces
automatically.

Reviewed-by: Antoine Beaupré <redacted>
Signed-off-by: Antoine Beaupré <redacted>
---
 contrib/mw-to-git/git-remote-mediawiki.perl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/mw-to-git/git-remote-mediawiki.perl b/contrib/mw-to-git/git-remote-mediawiki.perl
index a1d783789..6364d4e91 100755
--- a/contrib/mw-to-git/git-remote-mediawiki.perl
+++ b/contrib/mw-to-git/git-remote-mediawiki.perl

@@ -1334,7 +1334,8 @@ sub get_mw_namespace_id {
 	my $id;
 
 	if (!defined $ns) {
-		print {*STDERR} "No such namespace ${name} on MediaWiki.\n";
+		my @namespaces = map { s/ /_/g; $_; } sort keys %namespaces_id;