[FIX] web: avatar on empty field
[FIX] web: avatar on empty field

- Create a calendar event
- In debug mode, remove the responsible

The 'Avatar Undefined' string is displayed at the botton of the
responsibles' list.

Do no fetch an image for a falsy value (= falsy id)

opw-2010007

closes odoo/odoo#34215

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo