problem withproblem for a property to be optional

[Sofía Canio]

Hi team,
I am currently working with Isis version 1.17

I am trying to make the blob type property optional, however it doesn't seem to 
work as it is still seen as mandatory

This is my code

@javax.jdo.annotations.Persistent(defaultFetchGroup="false", columns = {
            @javax.jdo.annotations.Column(name = "fotos_name"),
            @javax.jdo.annotations.Column(name = "fotos_mimetype"),
            @javax.jdo.annotations.Column(name = "fotos_bytes", jdbcType = 
"BLOB", sqlType = "VARBINARY")
    })
    @Property(optionality = Optionality.OPTIONAL)
    @lombok.NonNull
    @Getter @Setter
    private Blob fotos;

https://cdn.discordapp.com/attachments/714621577383116810/821602020943331368/unknown.png

What should I do?

Thanks