(a) Amendments. The charging document may be amended by the issuing officer in open court at the time of a scheduled hearing before it commences, subject to the approval of the official. The official shall grant a continuance if the amendment requires one in the interests of justice. No case shall be dismissed by reason of any informality or irregularity in the charging instrument.
(b) Voluntary Dismissals. Upon an issuing officer filing a written notice of dismissal, a written request for dismissal, or a request for dismissal made in open court, the clerk of the court shall enter the dismissal in the court records.