Purpose
=======
Lighten the survey layout. Livechat button should not appear on survey pages.
Specifications
==============
Survey Layout inherits from web.frontend_layout, mainly to be able to use all
the styles rules defined in it and keep consistency between other frontend
pages and survey.
To avoid having the livechat button displayed on survey layout, 'no_livechat'
template variable has been introduced. The livechat button will be displayed
on all layout inheriting from frontend_layout (that is extended in
website_livechat to add that livechat button) only if 'no_livechat'
is False. By default, this variable is not set so will be considered as False.
In survey layout, no_livechat is set to True.
Links
=====
Task ID: 2195185
PR #45112
David Beguin
f9d34ec711