Before this commit:
when a user asks a question on a forum, share buttons are always showing even if
question is validated or not and hence it will lead to 404 error.

After this commit:
when a user asks a question on a forum, share buttons will only show after a
question is validated.

task-2064874

closes odoo/odoo#37505

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>