If no arguments are provided, the URI for the current action is returned.
To return the current action and also provide @args, use
-C<< $c->uri_for( $c->action, @args ) >>. Don't do
-C<< $c->uri_for( undef, @args ) >>.
+C<< $c->uri_for( $c->action, @args ) >>.
If the first argument is a string, it is taken as a public URI path relative
to C<< $c->namespace >> (if it doesn't begin with a forward slash) or