code: @Nonnegative
    public static int getSize (@Nullable final IIterableIterator <?> aIterator)
    {
      return aIterator == null ? 0 : getSize (aIterator.iterator ());
    }
docs: Retrieve the size of the passed {@link Iterable}.
  
  @param aIterator
  Iterable iterator to check. May be <code>null</code>.
  @return The number objects or 0 if the passed parameter is
  <code>null</code>.