Criminal charges have been dismissed against the leader of the Roman Catholic Diocese of Worcester after he pleaded guilty to refusing a post-accident alcohol test. WPRO-AM reported that the charges were dismissed Tuesday against Bishop Robert McManus, which is common for a first-time offender. The 61-year-old bishop was arrested last month near his vacation home in Narragansett after another motorist reported a hit-and-run accident. McManus has said he ‘‘made a terrible error in judgment’’ by driving after drinking wine at dinner. After he entered his guilty plea before the Rhode Island Traffic Tribunal last month, McManus’ license was suspended for six months.