fix ods to pdf conversion

java/py3oconvertor/py3oconverter/Convertor.java

@@ -92,5 +92,6 @@
 
     protected void refreshIndexes(XComponent document) {
         XDocumentIndexesSupplier indexsupplier = (XDocumentIndexesSupplier) UnoRuntime.queryInterface(XDocumentIndexesSupplier.class, document);
-		XIndexAccess indexaccess = indexsupplier.getDocumentIndexes();
+        if (indexsupplier != null) {
+    		XIndexAccess indexaccess = indexsupplier.getDocumentIndexes();
 
@@ -96,15 +97,16 @@
 
-        for (int i = 0;  i < indexaccess.getCount(); i++) {
-            try {
-                XDocumentIndex index = (XDocumentIndex) UnoRuntime.queryInterface(XDocumentIndex.class, indexaccess.getByIndex(i));
-                if (index != null) {
-                    index.update();
-                }
-             } catch (IndexOutOfBoundsException e) {
-                e.printStackTrace();
-             } catch (WrappedTargetException e) {
-                e.printStackTrace();
-             }
+            for (int i = 0;  i < indexaccess.getCount(); i++) {
+                try {
+                    XDocumentIndex index = (XDocumentIndex) UnoRuntime.queryInterface(XDocumentIndex.class, indexaccess.getByIndex(i));
+                    if (index != null) {
+                        index.update();
+                    }
+                 } catch (IndexOutOfBoundsException e) {
+                    e.printStackTrace();
+                 } catch (WrappedTargetException e) {
+                    e.printStackTrace();
+                 }
+            }
         }
             
    }