Append the content of this cell to *other_tc*, leaving this cell with
        a single empty ``<w:p>`` element.

def _move_content_to(self, other_tc):
        """
        Append the content of this cell to *other_tc*, leaving this cell with
        a single empty ``<w:p>`` element.
        """
        if other_tc is self:
            return
        if self._is_empty:
            return
        other_tc._remove_trailing_empty_p()
        # appending moves each element from self to other_tc
        for block_element in self.iter_block_items():
            other_tc.append(block_element)
        # add back the required minimum single empty <w:p> element
        self.append(self._new_p())