RFR : 7095856: OutputStreamHook doesn't handle null values

[Seán Coffey]

Looking for a review around this CORBA issue.

bug report : https://bugs.openjdk.java.net/browse/JDK-7095856
webrev : http://cr.openjdk.java.net/~coffeys/webrev.7095856/

Null values cause issue when processed by an IIOPOutputStream and I 
can't see a reason why they wouldn't be allowed. Note that the glassfish 
code already employs a HashMap to hold such values. I've run CORBA SQE 
tests, unit tests and relevant TCK tests. No issues seen.

regards,
Sean.