RE-Fix MPXDOC-136

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@179423 13f79535-47bb-0310-9956-ffa450edef68

xdoc/src/plugin-resources/templates/issue-tracking.xml

@@ -28,8 +28,12 @@
         <section key="template.issue_tracking.section.title"
             bundle="plugin-resources\templates\templates">
             <p>
+              #if ($project.issueTrackingUrl && $project.issueTrackingUrl != '')
                 #set ($url = $escape.getText($project.issueTrackingUrl))
                 <a href="$url">$url</a>
+              #else
+                No issue tracking available.
+              #end
             </p>
         </section>
     </body>