NPE when parsing simple input

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Run this code:
    Parser.toHtml("*[[Evoliucija]]\n", new SmartLinkResolver() {
      public String resolve(String arg0) {
        return "http://foo.com";
      }
    });

2. I get this exception:
Exception in thread "main" java.lang.NullPointerException
    at
be.devijver.wikipedia.parser.ast.UnorderedListItem.toString(UnorderedListItem.ja
va:17)
    at
be.devijver.wikipedia.parser.ast.parser.DefaultASTParser.doInvokeParseMethod(Def
aultASTParser.java:31)
    at
be.devijver.wikipedia.parser.ast.parser.AbstractASTParser.invokeParseMethod(Abst
ractASTParser.java:350)
    at
be.devijver.wikipedia.parser.ast.parser.AbstractASTParser.parseDocument(Abstract
ASTParser.java:62)
    at
be.devijver.wikipedia.parser.ast.parser.AbstractASTParser.parse(AbstractASTParse
r.java:52)
    at be.devijver.wikipedia.Parser.toHtml(Parser.java:32)
    at be.devijver.wikipedia.TestBug.main(TestBug.java:9)

What version of the product are you using? On what operating system?

version 0.1 with Java 1.6.0

Please provide any additional information below.

Original issue reported on code.google.com by misc2...@danielnaber.de on 15 Mar 2008 at 4:52