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
request.env['mail.message'].browse([int(kwargs.get('notification_id'))]).set_message_done()
        return True
    @http.route(['/forum/<model("forum.forum"):forum>',
                 '/forum/<model("forum.forum"):forum>/page/<int:page>',
                 '''/forum/<model("forum.forum"):forum>/tag/<model("forum.tag", "[('forum_id','=',forum[0])]"):tag>/questions''',
                 '''/forum/<model("forum.forum"):forum>/tag/<model("forum.tag", "[('forum_id','=',forum[0])]"):tag>/questions/page/<int:page>''',
                 ], type='http', auth="public", website=True)
    def questions(self, forum, tag=None, page=1, filters='all', sorting=None, search='', post_type=None, **post):
        Post = request.env['forum.post']
        domain = [('forum_id', '=', forum.id), ('parent_id', '=', False), ('state', '=', 'active')]
        if search:
            domain += ['|', ('name', 'ilike', search), ('content', 'ilike', search)]
        if tag:
            domain += [('tag_ids', 'in', tag.id)]
        if filters == 'unanswered':
            domain += [('child_ids', '=', False)]
        elif filters == 'followed':
            domain += [('message_partner_ids', '=', request.env.user.partner_id.id)]
        if post_type:
            domain += [('post_type', '=', post_type)]
        if sorting:
            
            
            try:
                Post._generate_order_by(sorting, None)
            except ValueError:
                sorting = False
        if not sorting:
            sorting = forum.default_order
        question_count = Post.search_count(domain)