Ireland’s justice minister resigned Wednesday in a surprise blow to the country’s 3-year-old coalition government after a state-ordered investigation concluded that he mishandled the complaints of a police corruption whistleblower. Alan Shatter said in a letter he was quitting to ease criticism of the government when the more than 300-page report is published later this week. Prime Minister Enda Kenny, who received the report Tuesday night, announced the news to the audible gasps of lawmakers in Ireland’s parliament. Many opposition politicians had called for Shatter to resign, but it’s rare in Ireland for any politician to quit in the face...