*: hr_gamification, point_of_sale, web
Before this commit, no content helper in some form view fields were broken,
due to the style of the classname `.o_view_nocontent` that uses an absolute
position.
This is due to some templates that wrongly use this style for displaying a
help message, although this is only valid for views with no record.
This commit solves the issue by using another classname for those fields
with the nocontent helper, namely `.o_field_nocontent`.
Alexandre Kühn
e4d3dfba49