How have courts used the presumption of abstention doctrine to withhold review of a pending petition?

abstention doctrine (Younger v. Harris, 401 U.S. 37, 43-54 (1971)) as another basis to withhold review of the pending petition, finding some ambiguity as to whether petitioner had been convicted of a crime at the time the magistrate judge received the petition, based on the dates provided by petitioner therein. The findings and recommendations were served upon all parties and contained notice that any objections were to be filed within thirty days from the date of service of that order. To date, no party has filed objections.