hg: jdk8/tl/jdk: 7105883: JDWP: agent crash if there exists a ThreadGroup with null name

[erik.gahlin at oracle.com]

Changeset: c077a2810782
Author:    egahlin
Date:      2013-10-23 10:50 +0200
URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/c077a2810782

7105883: JDWP: agent crash if there exists a ThreadGroup with null name
Reviewed-by: sla, jbachorik

! src/share/back/ThreadGroupReferenceImpl.c
+ test/com/sun/jdi/NullThreadGroupNameTest.java