A man who maintains he has been blocked from bringing his emotional support animal to Chicago beaches and parks got the go-ahead to pursue a claim under the Americans with Disabilities Act.In a written opinion last week, U.S. District Judge Harry D. Leinenweber did not rule on the merits of Kenneth William Mayle’s claim that the city and the Chicago Park District are denying him a reasonable accommodation by barring his Guinea hog from public spaces.But Leinenweber held the city and the park district failed to refute …