@Override
    public String toString() {
        return "Override{" +
                "hasOverride=" + hasOverride +
                ", value=" + value +
                '}';
    }
If an override value is present then the passed consumer will consume the override value
optional which may be empty if a null/empty override has explicitly been set.
stroom-core-shared/src/main/java/stroom/config/global/shared/OverrideValue.java