Click on any user name different from the current one;
Populate 'Имя' field with one space and click on [Save] button.
Expected result: User name is not updated. Validation message appears: "Имя пользователя должно содержать буквы и/или символы и/или цифры";
Actual result: User name is updated. User name remains as " ".
Steps to reproduce:
Expected result: User name is not updated. Validation message appears: "Имя пользователя должно содержать буквы и/или символы и/или цифры"; Actual result: User name is updated. User name remains as " ".