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)

first_char_tag = forum.get_tags_first_char()
        first_char_list = [(t, t.lower()) for t in first_char_tag if t.isalnum()]
        first_char_list.insert(0, (_('All'), 'all'))
        
        active_char_tag = first_char_list[1][1] if len(first_char_list) > 1 else 'all'
        if tag_char:
            active_char_tag = tag_char.lower()
        
        domain = [('forum_id', '=', forum.id), ('posts_count', '>', 0)]
        order_by = 'name'
        if active_char_tag and active_char_tag != 'all':
            domain.append(('name', '=ilike', tools.escape_psql(active_char_tag)+'%'))
            order_by = 'posts_count DESC'
        tags = request.env['forum.tag'].search(domain, limit=None, order=order_by)
        
        values = self._prepare_forum_values(forum=forum, searches={'tags': True}, **post)
        values.update({
            'tags': tags,
            'pager_tag_chars': first_char_list,
            'active_char_tag': active_char_tag,
        })
        return request.website.render("website_forum.tag", values)
    @http.route('/forum/<model("forum.forum"):forum>/edit_welcome_message', auth="user", website=True)
    def edit_welcome_message(self, forum, **kw):