Do not generate links to JXR files if they are not created.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@374441 13f79535-47bb-0310-9956-ffa450edef68

pmd/xdocs/changes.xml

@@ -25,6 +25,7 @@
   </properties>
   <body>
     <release version="1.8-SNAPSHOT" date="In SVN">
+      <action dev="aheritier" type="fix">Do not generate links to JXR files if they are not created.</action>
       <action dev="aheritier" type="update">Use properties maven.jxr.destdir and maven.jxr.destdir.test to generate links from the PMD report to jxr files.</action>
       <action dev="aheritier" type="fix">Fix NullPointerException if pom.build.sourceDirectory or pom.build.unitTestSourceDirectory are not defined.</action>
       <action dev="aheritier" type="update">Upgrade to pmd-3.4.</action>