[Backend] Unauthorized Handler is not defined for login_required routes

[sachinsom93]

Describe the bug All the routes which are protected by login_required decorator returns a internal server error response, this might leads to crash app, so a handler is required for unauthorized users.

To Reproduce Try to access any route that is protected using login_required decorator.

Expected behavior Should return a 401(Unauthorized response) error message.

Screenshots

Desktop (please complete the following information):

• Windows 10