[Quote builder] print to pdf 

- Task: https://www.odoo.com/web#id=9286&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.J3mShCzM9sV03MEw
Since website_quote.so_quotation is now use in a report, you shoud modify it as follows : each time website.image_url is called in website_quote.xml, check if website exists (e.i. : website and website.image(partner, 'img_small')).