added checking to not add an item twice to a data list when it is added by id
added checking to not add an item twice to a data list when it is added by id


Former-commit-id: 5457b011cf9a8ebde550b02bdc0bdbbfcd6051ed
cesine/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,cesine/iLanguage,cesine/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,cesine/iLanguage,cesine/iLanguage,vronvali/iLanguage,vronvali/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,iLanguage/iLanguage