Merge pull request #3316 from aled/check-stored-password-exists

Fix server error when user enters a password, but none is set.

Jellyfin.Server.Implementations/Users/DefaultAuthenticationProvider.cs

@@ -63,6 +63,9 @@ namespace Jellyfin.Server.Implementations.Users
                 });
             }
 
+            // Handle the case when the stored password is null, but the user tried to login with a password
+            if (resolvedUser.Password != null)
+            {
                 byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
 
                 PasswordHash readyHash = PasswordHash.Parse(resolvedUser.Password);
@@ -83,6 +86,7 @@ namespace Jellyfin.Server.Implementations.Users
                 {
                     throw new AuthenticationException($"Requested crypto method not available in provider: {readyHash.Id}");
                 }
+            }
 
             if (!success)
             {