msxml3/tests: Added more tests to ISAXXMLReader_putContentHandler and ISAXXMLReader_getContentHandler, added todo test for ISAXXMLReader_parse

[Alistair Leslie-Hughes]

Piotr Caban wrote:
> ---
>  +    hr = ISAXXMLReader_getContentHandler(reader, &lpContentHandler); 

Hi Piotr,
   You might want to add the test.
hr = ISAXXMLReader_getContentHandler(reader, NULL);

Best Regards
  Alistair Leslie-Hughes