code: public List getValuedChilds(String label) {
  		List ret = getChilds(label);
  		Iterator it = ret.iterator();
  		while (it.hasNext()) {
  			AbcNode node = (AbcNode) it.next();
  			if (node.hasError()
  				|| (node.getValue() == null)
  				|| (node.getValue().length() == 0))
  				it.remove();
  		}
  		return ret;
  	}
docs: Returns a list of childs having the requested label and an non-empty
  value, and no error.
  <p>
  Can get directly grandchilds if label contains <tt>/</tt> e.g.
  titleFields.getChild("FieldTitle/TexText") returns all grandchilds
  "TexText" in all "FieldTitle" childs.