Chessa::Bug: really unbreak global snippets

scripts/Chessa/Bug.pm

@@ -141,7 +141,7 @@ sub parse($self, $input, $on_info, $src, $errors) {
             $project = $self->{conf}{default_project};
             $group   = $self->{conf}{default_group};
         }
-        $project = join '/', $group, $project;
+        $project = join '/', $group, $project unless (!length($project));
 
         if (($project !~ /:/) && defined($src)) {
             $project = "$src:$project";