Sitemap was always generated because the navigation file was not parsed yet

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@329665 13f79535-47bb-0310-9956-ffa450edef68

xdoc/plugin.jelly

@@ -720,8 +720,15 @@
     </j:forEach>
 
     <!-- Generate sitemap -->
-    <j:if test="${!nav.sitemap.isEmpty()}">
-        <attainGoal name="xdoc:sitemap-noinit"/>
+    <util:available file="${maven.docs.src}/${maven.xdoc.navigation.file}">
+      <util:file var="siteNavFile" name="${maven.docs.src}/${maven.xdoc.navigation.file}"/>
+    </util:available>
+    <j:set var="navFile" value="${siteNavFile}" />
+    <j:if test="${navFile != null}">
+      <x:parse var="navXML" xml="${navFile}"/>
+      <x:if select="$navXML/project/body/sitemap">
+          <attainGoal name="xdoc:sitemap-noinit"/>
+      </x:if>
     </j:if>
 
     <!-- Copy all generated files in an internationalize site structure, ie: