The EVB (Bob Parker) ESR meter can only measure up to 99 ohms, above that it only displays -. If it doesn't measure anything in-circuit that means that the cap is open (> 99 ohms) and needs to be replaced. Taking the cap out of the circuit wouldn't make a difference in this case because in-circuit ESR measurement can cause the indicated ESR being lower than it actually is (due to components in parallel) but not higher. I.e. if the in-circuit ESR measurement indicates that the ESR is too high you can be sure that the cap is bad, however if the in-circuit ESR measurement indicates that the ESR is acceptable it still might mean that the cap is bad and you might need measure it out of the circuit after all.