code: public static List<String> getPropertyValues( AbstractBlockHolder holder, String propertyName ) {
  
  		List<String> result = new ArrayList<> ();
  		for( BlockProperty p : holder.findPropertiesBlockByName( propertyName )) {
  			result.addAll( Utils.splitNicely( p.getValue(), ParsingConstants.PROPERTY_SEPARATOR ));
  		}
  
  		return result;
  	}
docs: Gets and splits property values separated by a comma.
  @param holder a property holder (not null)
  @return a non-null list of non-null values