BERLIN (Reuters) - Chancellor Angela Merkel has canceled a news conference with Dutch Prime Minister Mark Rutte that had been planned for Monday, her office said, after German coalition talks collapsed overnight. The chancellery gave no reason for the cancellation of the news conference, which had been scheduled for 1 p.m. (1200 GMT).  Merkel said earlier on Monday her efforts to form a three-way coalition government had failed, thrusting Germany into a political crisis. 