Catch "Failed to look up view" error and serve 404

I am currently routing every page to my pagesController that cannot be found in previous routes by including this line in routes.js:

this.match('/:page', { controller: 'pages', action: 'show' });

I had the idea to let my PagesController handle serving a 404 if not found:

PagesController.show = function() {
    var page = this.param('page');
    if(page != undefined){
        page = page.replace(".html","");        
        try {
            this.render("./"+page);
        } catch(error){ //Failed to look up view -- not working at the moment =(
            this.redirect({action : "404"});
        };
    }

    return;
};

But my idea is failing. The error cannot be caught, so the fatal still gets served. Should I append a fn to the render call? With what arguments? How does it work? (/simple questions).

It might look something like this:

PagesController.show = function() {
  var self  = this;
  var page  = this.param('page');

  if (page !== undefined) {
    page = page.replace('.html', '');
    this.render("./" + page, function(err, html) {
      if (! err)
        return self.res.send(html);
      self.redirect({ action : '404' });
    });
  } else {
    // this will probably never be called, because `page`
    // won't be undefined, but still...
    this.redirect({ action : '404' });
  }
};