code: function () {
  			
  			var i, length, radioInput;
  			
  			for (i = 0, length = this.choicesList.length ; i < length ; i += 1) {
  				
  				radioInput = this.choicesList[i].node.firstChild;
  				
  				if (radioInput.checked) {
  					
  					// if "any" option checked
  					if (this.radioAny && this.radioAny == radioInput) {
  						
  						return this.anyField.getValue() === '';
  						
  					} else {
  						
  						return false;
  						
  					}
  				}
  			}
  			
  			return true;
  			
  		}
docs: Should return true if empty