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.

def has_text_frame(self):
        """
        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.
        """
        dLbl = self._dLbl
        if dLbl is None:
            return False
        if dLbl.xpath('c:tx/c:rich'):
            return True
        return False