[IMP] website_forum: Post new answer time check user email is proper val...

...idated otherwise redirect to a user profile page along with proper message for update valid email address

 - Task: https://www.odoo.com/web#id=8857&view_type=form&model=project.task&action=333&active_id=131
 - Pad: https://pad.odoo.com/p/r.4IqjzSIiJLKi7q03