checkconfig: don't warn if $config{url} is undef

The warning was "Use of uninitialized value $IkiWiki::config{"url"} in
length" when running a modified t/tag.t.

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 926d42a497159845ae8ab94c62a054374a61d468..93d2c326d300209cf8f6af51905ec34bccd80b64 100644 (file)
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -544,7 +544,7 @@ sub checkconfig () {
                error(gettext("Must specify url to wiki with --url when using --cgi"));
        }
 
-       if (length $config{url}) {
+       if (defined $config{url} && length $config{url}) {
                eval q{use URI};
                my $baseurl = URI->new($config{url});