code: def has_text_frame(self):
          
          dLbl = self._dLbl
          if dLbl is None:
              return False
          if dLbl.xpath('c:tx/c:rich'):
              return True
          return False
docs: Return |True| if this data label has a text frame (implying it has
          custom data label text), and |False| otherwise. Assigning |True|
          causes a text frame to be added if not already present. Assigning
          |False| causes any existing text frame to be removed along with any
          text contained in the text frame.