[easy] batch-coverage: cheaper check for lazy mode
[easy] batch-coverage: cheaper check for lazy mode

Reviewed By: panagosg7

Differential Revision: D16962659

fbshipit-source-id: 0c7213c4e56859645509d2207857579e6277cfbb

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow