docs: def clear_content(self):
          """
          Remove all content child elements, preserving the ``<w:tcPr>``
          element if present. Note that this leaves the ``<w:tc>`` element in
          an invalid state because it doesn't contain at least one block-level
          element. It's up to the caller to add a ``<w:p>``child element as the
          last content element.
          """
          new_children = []
          tcPr = self.tcPr
          if tcPr is not None:
              new_children.append(tcPr)
          self[:] = new_children