Fix marshalling of null values in base64Binary, hexBinary

19:53:55,783 ERROR [SOAPFaultExceptionHelper] SOAP request exception
java.lang.IllegalArgumentException: multipart/related stream invalid, no root part was found
at org.jboss.ws.soap.attachment.MultipartRelatedDecoder.decodeMultipartRelatedMessage(MultipartRelatedDecoder.java:153)
at org.jboss.ws.soap.MessageFactoryImpl.createMessageInternal(MessageFactoryImpl.java:185)
at org.jboss.ws.soap.MessageFactoryImpl.createMessage(MessageFactoryImpl.java:145)

/home/tdiesler/svn/jbossws/branches/jbossws-1.0/src/test
[tdiesler@tddell test]$ ant -Dtest=jaxrpc/marshall test

tests-main:
[junit] Running org.jboss.test.ws.jaxrpc.marshall.MarshallDocLitTestCase
[junit] Tests run: 63, Failures: 0, Errors: 0, Time elapsed: 14.64 sec
[junit] Running org.jboss.test.ws.jaxrpc.marshall.MarshallRpcLitDIITestCase
[junit] Tests run: 63, Failures: 0, Errors: 2, Time elapsed: 6.636 sec
[junit] Test org.jboss.test.ws.jaxrpc.marshall.MarshallRpcLitDIITestCase FAILED
[junit] Running org.jboss.test.ws.jaxrpc.marshall.MarshallRpcLitTestCase
[junit] Tests run: 63, Failures: 0, Errors: 1, Time elapsed: 11.84 sec
[junit] Test org.jboss.test.ws.jaxrpc.marshall.MarshallRpcLitTestCase FAILED