It was 3 a.m. on May 21, 2012, and Steven P. Mandell couldn’t see his client. Mandell and a colleague waited outside the police station at Belmont and Western avenues during the NATO summit, surrounded by protesters. Their client, Getty Images photographer Joshua Lott, was inside awaiting their assistance. Lott’s troubles began earlier when he photographed Chicago police in a physical confrontation with a protester on Wabash Street near Jackson Boulevard. The officers told Lott to stop snapping …