RFR: 7105883: JDWP: agent crash if there exists a ThreadGroup with null name

[Erik Gahlin]

Hi,

Could I please have a review of this fix.

An empty string is returned if the thread name is null. The protocol 
should be updated to support INVALID_STRING for the Thread Reference 
Command <#Error_INVALID_STRING>, but that is a larger effort and 
probably better to do when fixing other protocol changes. An empty 
string is better than a crash.

Thanks
Erik

Webrev:
http://cr.openjdk.java.net/~egahlin/7105883/

Bug:
https://bugs.openjdk.java.net/browse/JDK-7105883

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