The outcome of ValidateAvatarInput. Empty strings are normalised to null (clear).
null
Optional
Why the input was refused. Set only when Valid is false.
Valid
The value to store in UserImageIconClass; null clears it.
UserImageIconClass
The value to store in UserImageURL; null clears it.
UserImageURL
The outcome of ValidateAvatarInput. Empty strings are normalised to
null(clear).