avoid uninitlized value when urlto is called with 1 parameter and no url is configured

This brings back the old behavior before urlto changes for this case.
It will generate a path like "/foo", which is not right, but is
the same as is generated by urlto($page, "", 1) -- which is what
the code that now uses 1-parameter urlto used to use.

1 files changed, 1 insertions, 1 deletions

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 7d1f5c401..9de25a4b3 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -1168,7 +1168,7 @@ sub urlto ($;$$) {
 	}
 
 	if (! defined $from) {
-		my $u = $local_url;
+		my $u = $local_url || '';
 		$u =~ s{/$}{};
 		return $u.beautify_urlpath("/".$to);
 	}