Impacted versions:
Latest Odoo Forum

Steps to reproduce:
Get a nofitication from the Odoo forum (by subscription or by a comment to your posting)

Current behavior:
The notification email contain the subject: "Re: False" and contains no link to the forum post.
Expected behavior:
The notification email contains the title of the forum post and a link to the forum post.
Video/Screenshot link (optional):

![selection_195](https://cloud.githubusercontent.com/assets/1814941/15383579/60b554b0-1d94-11e6-8b1b-875a11e3d82b.png)

addons/website_forum/controllers/main.py
if partner_id:
            partner = request.env['res.partner'].sudo().search([('id', '=', partner_id)])
            if partner and partner.user_ids:
                return werkzeug.utils.redirect("/forum/%s/user/%d" % (slug(forum), partner.user_ids[0].id))
        return werkzeug.utils.redirect("/forum/%s" % slug(forum))
    @http.route(['/forum/user/<int:user_id>/avatar'], type='http', auth="public", website=True)
    def user_avatar(self, user_id=0, **post):
        status, headers, content = binary_content(model='res.users', id=user_id, field='image_medium', default_mimetype='image/png', env=request.env(user=openerp.SUPERUSER_ID))
        if not content:
            img_path = openerp.modules.get_module_resource('web', 'static/src/img', 'placeholder.png')
            with open(img_path, 'rb') as f:
                image = f.read()
            content = image.encode('base64')
        if status == 304:
            return werkzeug.wrappers.Response(status=304)
        image_base64 = base64.b64decode(content)
        headers.append(('Content-Length', len(image_base64)))
        response = request.make_response(image_base64, headers)
        response.status = str(status)
        return response
    @http.route(['/forum/<model("forum.forum"):forum>/user/<int:user_id>'], type='http', auth="public", website=True)
    def open_user(self, forum, user_id=0, **post):
        User = request.env['res.users']
        Post = request.env['forum.post']
        Vote = request.env['forum.post.vote']
        Activity = request.env['mail.message']