Missing template for doctest_block

[tomschr]

Problem description

Some files create a definition list like this:

<definition_list>
   <definition_list_item>
      <term>Usage:</term>
      <definition>
         <doctest_block xml:space="preserve">&gt;&gt;&gt; @wip('Expected Error', expected_exception=Exception, bug="#000000")
&gt;&gt;&gt; def test():
&gt;&gt;&gt;     pass</doctest_block>
      </definition>
   </definition_list_item>
</definition_list>

Actual behaviour

The DocBook's <listitem/> is empty.

Expected behaviour

<variablelist>
  <varlistentry>
    <term>Usage:</term>
    <listitem>
        <screen>...</screen>
    </listitem>
  </varlistentry>
</variablelist>