When an application is filed with the Board, it is up to the applicants to ask the Board to withdraw their application if they don’t want to proceed. I believe the Board requires this to be done in writing. If it’s not withdrawn, the hearing will still be held. I suggest trying to contact your former tenant, if possible, to ask that they withdraw their application with the Board. Otherwise, you would have to attend the hearing. If they do not show up for the hearing then the Board will dismiss their application.