(a) The court may impose a sentence of unconditional discharge in any case where it is authorized to impose a sentence of conditional discharge under section 53a-29 , if the court is of the opinion that no proper purpose would be served by imposing any condition upon the defendant's release.
(b) When the court imposes a sentence of unconditional discharge, the defendant shall be released with respect to the conviction for which the sentence is imposed without imprisonment, probation supervision or conditions. A sentence of unconditional discharge is for all purposes a final judgment of conviction.