code: public boolean isEmpty() {
          switch(size()) {
              case 0:
                  return true;
              case 1:
                  Element element = (Element) get(0);
                  if (element.type() == Element.CHUNK && ((Chunk) element).isEmpty()) {
                      return true;
                  }
                  return false;
                  default:
                      return false;
          }
      }
docs: Checks is this <CODE>Phrase</CODE> contains no or 1 empty <CODE>Chunk</CODE>.
  
  @return	<CODE>false</CODE> if the <CODE>Phrase</CODE>
  contains more than one or more non-empty<CODE>Chunk</CODE>s.