opendap/src/main/java/ucar/nc2/dods/DodsV.java
DodsV findByIndex(int index) {
    if (children.size() <= index) return null;
    return children.get(index);
  }
DodsV findByIndex(int index) {
    if (children.size() <= index) return null;
    return children.get(index);
  }
Return a child by index

@param index return index'th child
@return index'th child or null if index is too large