In this commit we have added new method name isHtmlEmpty in
kanban view. As we are convertting text field to html field,
we will need to check html field in if conditions.
As Html field will contain tags we cannot check it every time
perfectly. So, we need this method to make sure html field is
empty or not.
Task id: 2499504
X-original-commit: 2968dcea7fb58795eeb34949f4bbfc1029938cd1
dht-odoo
18ad07c001