Improvement login

[Denis86728]

Hello. I practice on your website and I have an improvement for the login page.
Preconditions:

1. Navigate to "Sign in" page
   Steps to reproduce:
2. Click on "Sign in" button
   Expected result:
3. For the "Password" field a validation error should be displayed, informing the user that the "Password" field is mandatory
   Actual result:
4. Mandatory validation error is displayed only for the username field

It should be nice if both fields have mandatory validation errors.