Conditional Discharge , generally means you are ordered to meet certain conditions for - a period of time - one of which is to not get into anymore trouble with the law during this specified period.
Vacate = set aside .
In this case it would mean no more order .
Although depending on the circumstances,maybe the CD was vacated,and more serious offenses brought against the offender.
What do you think ? Maybe the person that had the CD should be asking this ATTN: ?