guard against lastrev being "" just in case

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index 60424bbda10c9355e88b9cc716f3d9b96ceb3a09..57418f2ed5e3bf25af869c834037ae0ff734c10b 100644 (file)
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -834,7 +834,7 @@ sub refresh () {
        srcdir_check();
        run_hooks(refresh => sub { shift->() });
        my ($files, $pages, $new, $internal_new, $del, $internal_del, $changed, $internal_changed);
-       if (! $config{rebuild} && want_find_changes() && defined $IkiWiki::lastrev) {
+       if (! $config{rebuild} && want_find_changes() && defined $IkiWiki::lastrev && length $IkiWiki::lastrev) {
                my ($changed_raw, $del_raw);
                ($changed_raw, $del_raw, $IkiWiki::lastrev) = $IkiWiki::hooks{rcs}{rcs_find_changes}{call}->($IkiWiki::lastrev);
                ($files, $pages)=process_changed_files($changed_raw, $del_raw);
@@ -843,7 +843,7 @@ sub refresh () {
                ($files, $pages)=find_src_files();
        }
        if (want_find_changes()) {
-               if (! defined($IkiWiki::lastrev)) {
+               if (! defined($IkiWiki::lastrev) || ! length $IkiWiki::lastrev) {
                        $IkiWiki::lastrev=$IkiWiki::hooks{rcs}{rcs_get_current_rev}{call}->();
                }
        }