Good Character (1 caution not shown on my CRB)

[avatar16]

Hi All;

9 years ago I did some stupid things and i had one caution and it was registered on my CRB for couple years but last year i noticed during a process of recruitment that my CRB came and it shows that i have nothing in it (NONE) which mean that caution is not registered or it maybe was deleted by the police from my CRB. my question is should I say it in the form or because is no longer on my CRB, so is not important to talk about it? do you think it can cause me loosing the the chance to have citizenship as they may use that as fault declaration and will be refused for 10 years?

thanks