XSL - test for empty and create UL

xsl-test-empty-emit-ul.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output omit-xml-declaration="yes" indent="yes" />
	<xsl:strip-space elements="*" />
	<xsl:template match="/">
		<table>
			<thead>
				<tr>
					<th>Make</th>
					<th>Model</th>
					<th>Passengers</th>
				</tr>
			</thead>
			<tbody>
				<xsl:apply-templates />
			</tbody>
		</table>
	</xsl:template>

	<xsl:template match="/cars/car">
		<tr>
			<td><xsl:value-of select="@make" /></td>
			<td><xsl:value-of select="@model" /></td>
			<td>
				<xsl:if test="passenger">
					<ul>
						<xsl:apply-templates />
					</ul>
				</xsl:if>
			</td>
		</tr>
	</xsl:template>

	<xsl:template match="passenger">
		<li><xsl:value-of select="@name" /></li>
	</xsl:template>

</xsl:stylesheet>