Currently, when a user created with default access rights,
but doesn't have employee linked with user then it will generate a
traceback because if user is not linked with employee then
it will return null so due to that while rednering the template
error was generated.
So in this commit, fix the treaceback by returning default values
if the current user had no employee
closes odoo/odoo#53161
Taskid: 2262636
Closes: #51687
X-original-commit: 96de35eda1a8e6e5086eb8221e939f3f737a9a6c
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>