RFR 8188098: NPE in SimpleTreeVisitorES6 visitor when parsing a tagged template literal

[Hannes Wallnöfer]

+1, good catch!

Hannes

> Am 28.09.2017 um 18:38 schrieb Sundararajan Athijegannathan <sundararajan.athijegannathan at oracle.com>:
> 
> Please review.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8188098
> Webrev: http://cr.openjdk.java.net/~sundar/8188098/webrev.00/
> 
> Thanks,
> -Sundar