Branch3

Summary by Bito

Updates to UserController class implementing enhanced null value handling across authentication, registration, and view handling methods, with improved error handling through null returns and parameters. The PR also revises method signatures in test files to ensure better alignment with project standards, correcting syntactical issues by adding missing parentheses to method declarations, contributing to code consistency and preparing for additional controller enhancements.

Unit tests added: False

Estimated effort to review (1-5, lower is better): 1