JDOMResult.getDocument() should return null when content is not legal.

[rolfl]

The code should do what the code's comment say it should do....

        try {
          JDOMFactory f = this.getFactory();
          if (f == null) { f = new DefaultJDOMFactory(); }

          doc = f.document(null);
          doc.setContent((List)result);

          result = doc;
        }
        catch (RuntimeException ex1) {
          // Some of the result nodes are not valid children of a
          // Document node. => return null.
        }

but, in the catch block, it does not set the 'doc' to null !!!