public boolean isNull() {
        return null == resultObject;
    }
Determines if the result item is null or not.  This is often a good check prior to calling other methods to
get the object as they could throw an unexpected {@link NullPointerException} if the result item is
{@code null}.
gremlin-driver/src/main/java/org/apache/tinkerpop/gremlin/driver/Result.java