protected PlaceHolderLine createPlaceHolderLine(ValidatableLine oppositeLine) {
		// for now, base representations do not know how to create empty lines...if it turns out
		// that there is a need for one, then we can create a basic empty line to go here
		return null;
	}
Extension point for adding empty lines.  Subclasses that do not wish to use the default
empty text line can override this method.
@param oppositeLine the line that will go along with the newly created placeholder line
@return the placeholder line
Ghidra/Features/Base/src/main/java/ghidra/app/util/html/HTMLDataTypeRepresentation.java