Yes. Because, in Ohio, a "pretrial" is an informal conference between the parties, not a legal requirement.
Here's what one lawyer's site says about it:
Most, but not all, judges will set what is called a "pretrial" in the criminal prosecution process. The use of the word "trial' in the term "pretrial" is technically misleading in that there is really no official court proceeding at all. A pretrial is basically just an informal meeting between the prosecutor and the defendant's attorney to discuss the facts of the case and a possible plea arrangement. In almost all cases, the defendant must be present on this court date. If the prosecutor and the defense attorney reach a plea arrangement, the judge will go on the bench and officially take the plea and, in most cases, refer the defendant to the appropriate probation department for a presentence investigation. However, if the judge chooses to do so, he may sentence the defendant immediately after the plea.
If you do not have an attorney, discussing points of law at a pretrial is kind of pointless, hence the reason the judge does not want to waste everyone's time.