RFR(XS) 8169551: Segfaults in error traces when module version is null

[Lois Foltan]

Looks good.
Lois

On 11/14/2016 9:02 AM, harold seigel wrote:
> Hi,
>
> Please review this small fix for JDK-8169551.
>
> Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8169551/
>
> JBS bug: https://bugs.openjdk.java.net/browse/JDK-8169551
>
> The fix was tested with the JCK Lang and vm tests, the JTreg hotspot, 
> java/io, java/lang, and java/util tests, the nsk co-located and the 
> non-co-located tests, and the RBT tier2 tests.
>
> Thanks, Harold
>