code: public <T> boolean operator_add(/* @Nullable */ EList<? super T> list, /* @Nullable */ Iterable<? extends T> elements) {
  		boolean result = false;
  		if(list != null && elements != null)
  			for(T element: elements) 
  				result |= operator_add(list, element);
  		return result;
  	}
docs: Overrides  the default <code>operator_add()</code> to ignore <code>null</code> elements.