PDFBOX-5932: avoid NPE

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1922710 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

debugger/src/main/java/org/apache/pdfbox/debugger/pagepane/PagePane.java

@@ -149,6 +149,10 @@ private void collectLinkLocations() throws IOException
 
     private void collectLinkLocation(PDAnnotationLink linkAnnotation) throws IOException
     {
+        if (linkAnnotation.getRectangle() == null)
+        {
+            return;
+        }
         PDAction action = linkAnnotation.getAction();
         if (action instanceof PDActionURI)
         {
@@ -209,7 +213,7 @@ private void collectFieldLocations() throws IOException
             {
                 // check if the annotation widget is on this page
                 // (checking widget.getPage() also works, but it is sometimes null)
-                if (dictionarySet.contains(widget.getCOSObject()))
+                if (dictionarySet.contains(widget.getCOSObject()) && widget.getRectangle() != null)
                 {
                     rectMap.put(widget.getRectangle(), "Field name: " + field.getFullyQualifiedName());
                 }