removed mandatory affiliation

Author: Andrea-Perelli

jjodel-persistence/jjodel-persistence/Controllers/API/AccountController.cs

@@ -314,7 +314,7 @@ public async Task<IActionResult> Register([FromBody] RegisterRequest request) {
                         NewsletterEnableDate = request.NewsletterEnabled ? DateTime.UtcNow : DateTime.MinValue,
                         Country = request.Country,
                         BirthDate = request.BirthDate.HasValue ? request.BirthDate.Value : DateTime.MinValue,
-                        Affiliation = request.Affiliation,
+                        Affiliation = !string.IsNullOrEmpty(request.Affiliation) ? request.Affiliation : "",
                         PhoneNumber = request.PhoneNumber,
                         RegistrationDate = DateTime.UtcNow
                     };

jjodel-persistence/jjodel-persistence/Models/Dto/RegisterRequest.cs

@@ -14,8 +14,8 @@ public class RegisterRequest {
         [Required]
         public string Nickname { get; set; }
 
-        [Required]
-        public string Affiliation { get; set; }
+        
+        public string? Affiliation { get; set; }
 
         [Required]
         public string Country { get; set; }