* Finance minister pledges never to leave Qatar vulnerable again. : DOHA (Reuters) - Qatar’s 2018 state budget will focus on developing local industries and the private sector as the country works to make itself self-sufficient in the face of a boycott by other Arab states, Finance Minister Ali Sherif al-Emadi said on Tuesday. In a speech to an international business conference, delivered exactly six months after Saudi Arabia, the United Arab Emirates, Bahrain and Egypt cut diplomatic and trade ties with Qatar, Emadi said the economy had escaped serious damage.