don't try to create bookmarks in output unless there are some in the input (getting NPE)

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196847 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/apps/Document.java

@@ -101,7 +101,7 @@ public class Document implements FOTreeControl, FOTreeListener {
     public AreaTree areaTree;
     public AreaTreeModel atModel;
 
-    private Bookmarks bookmarks;
+    private Bookmarks bookmarks = null;
 
     /**
      * Main constructor

src/java/org/apache/fop/layoutmgr/LayoutManagerLS.java

@@ -139,6 +139,9 @@ public class LayoutManagerLS extends LayoutStrategy {
      * the extension to the area tree.
      */
     public void addBookmarksToAreaTree() {
+        if (document.getBookmarks() == null) {
+            return;
+        }
         document.getDriver().getLogger().debug("adding bookmarks to area tree");
         BookmarkData data = new BookmarkData();
         for (int count = 0; count < document.getBookmarks().getOutlines().size(); count++) {