fix ul to div/ul in xsl3

etherpad_to_hdoc/antce/xsl/html2xhtml3.xsl

@@ -15,7 +15,7 @@
     <!--More specific template for Node766 that provides custom behavior -->
     <xsl:template match="body">
         <xsl:choose>
-            <xsl:when test="ul">
+            <xsl:when test="div/ul">
                 <xsl:copy>
                     <xsl:value-of select="ul"/>
                 </xsl:copy>