The Kings kept the pressure on Dallas Stars goaltender Kari Lehtonen for extended periods, but couldn’t beat him in the second period Thursday night at Staples Center. In fact, for all the Kings’ dominance, they couldn’t score. They had 18 shots on net in the middle period and exteneded their overall advantage over the Stars to 30-15. But they couldn’t put the puck in the back of the net. In fact, it was Kings goalie Jonathan Quick who had to make a couple of big saves late in the period to keep the game scoreless.