This formula turns the Harvey Ball gray even when there is a blank child. What am I missing?
=IF(COUNTIF(CHILDREN(), "Red") > 0, "Red", IF(COUNTIF(CHILDREN(), "Yellow") > 0, "Yellow", IF(COUNTIF(CHILDREN(), "Green") > 0, "Green", IF(COUNTIF(CHILDREN(), "Update") >= 1, "Update", IF(COUNTIF(CHILDREN(), "Gray") = COUNT(CHILDREN()), "Gray", "TBD")))))