Jon Niese’s season will resume. The Mets left-hander received “positive news” yesterday, according to assistant general manager John Ricco, when a follow up MRI exam in New York revealed no further damage to his shoulder. Niese was placed on the disabled list 2 1/2 weeks ago with a partial tear of the left rotator cuff. “Basically the new MRI showed the inflammation is gone and the fluid is out of his shoulder,” Ricco said before the Mets faced the Giants last night. “He has normal wear and tear in his shoulder, but otherwise it looks pretty good.” Niese has been cleared to resume throwing and was on his way to Port St. Lucie yesterday to begin workouts. Ricco said he expects Niese back on a mound within “a few” weeks and to rejoin the Mets this season. * Shaun Marcum was examined in St. Louis, but Ricco said the team won’t have an update on the right-hander’s condition until tomorrow. Marcum has been bothered by numbness in his right hand and tingling sensations. He underwent an MRI on his upper back last week.