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.

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